Digital Foundry: next-gen PlayStation and Xbox to use AMD's 8-core CPU and Radeon HD

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shady28

Platinum Member
Apr 11, 2004
2,520
397
126
How do you figure? A 7950 or abouts there would be perfectly inline with the 360/PS3's hardware relative to when they were released. All of the rumors are pointing to something in the 7670-7770 range, likely with lower clock speeds. A 7670 could certainly be considered an HTPC GPU, especially by the time one of these consoles actually comes out. It would be comparable to a PS3 launching with an Nvidia 6600 GT, and that's being generous. That wouldn't have impressed anybody then either.

MS would have to release the 720 with a GPU comparable to the fastest AMD GPU out at the time, with technology that won't even available on the PC for another generation for things to be comparable to the last console release. Instead, we're getting a GPU that was mid-range 2 years ago.

Not true. The PS3 had what was essentially half of a nvidia 7950gt.

Half of a current radeon 7950 would roughly be a radeon 7750.
 

Olikan

Platinum Member
Sep 23, 2011
2,023
275
126
No, it's not that much faster, just compare 6970 with Tahiti LE.

Tahiti is just 22% faster despite having it's core clocked over 8% faster and more memory bandwidth to boot. After equalizing clocks it would be about 15% faster. How did you come up with that 50% figure? It's just ridiculous.

same shaders, same bandwidth, shame clocks...

http://www.inpai.com.cn/doc/hard/168475_30.htm

the review in this link was using the RC11 drivers... you can give more than 20% since last driver...
 
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Lepton87

Platinum Member
Jul 28, 2009
2,544
9
81
same shaders, same bandwidth, shame clocks...

http://www.inpai.com.cn/doc/hard/168475_30.htm

the review in this link was using the RC11 drivers... you can give more than 20% since last driver...

3 games? I linked a comparison with a broad variety of games, and on average faster clocked Tahiti with the same number of shaders was 22% faster with new drivers that boosts performance than Cayman, so GCN is certainly less than 20% faster shader for shader than VLIW 4. It makes sense since average VLIW 4 utilization is about 3.5 shaders.
BTW. that Chinese comparison is with Pitcarin not tahiti. VLIW isn't a bad idea for purely graphics workloads, it's probably more efficient in terms of performance per mm2, 1-way shaders were introduced due to compute performance which VLIW is generally very weak at barring some exceptions.
 
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Olikan

Platinum Member
Sep 23, 2011
2,023
275
126
3 games? I linked a comparison with a broad variety of games, and on average faster clocked Tahiti with the same number of shaders was 22% faster with new drivers that boosts performance than Cayman, so GCN is certainly less than 20% faster shader for shader than VLIW 4. It makes sense since average VLIW 4 utilization is about 3.5 shaders.
BTW. that Chinese comparison is with Pitcarin not tahiti. VLIW isn't a bad idea for purely graphics workloads, it's probably more efficient in terms of performance per mm2, 1-way shaders were introduced due to compute performance which VLIW is generally very weak at barring some exceptions.

ok...average of 20%, but sometimes reaching 50%
not really that off of mine's 30%-50%
 

Kingbee13

Senior member
Jul 17, 2007
238
21
81
keep in mind that the PS3 was released around the same time as the Geforce 8800GTX, and the PS3 GPU was significantly slower than even a 7950GT, so it wasn't great...

I seem to recall it was a 7800 derivative, but my memory is awful
 

shady28

Platinum Member
Apr 11, 2004
2,520
397
126
False:
http://en.wikipedia.org/wiki/RSX_'Reality_Synthesizer'

Don't confuse bandwith with the GPU.


I wasn't, and if you look at what you linked at and look at a 7950GT you'll find the PS3 is basically half a 7950GT with the exception of the shaders - which are identical.

Examples (PS3/7950GT):

Memory interface : 128bit / 256bit
Pixel Fill rate : 4.4 Gigapixel / 13.2 Gigapixel
Render Units (ROPS) : 8 / 16
Memory bandwidth : 22.4GBs / 44.8GBs

If you look at general performance specs, the RSX looks like an slightly underclocked 7600GT with double the number of shaders.

No matter how you slice this though, the PS3 (and the Xbox) GPU's were in no way top of the line at release. They were at best upper midrange in comparison to PC video cards. At that time, midrange was really a $100-$150 card.

So I think the comparison would be something more like a Radeon 7750 or a GTX 650 today.

Probably also worth a note - advancements in the last 5-7 years have been much slower than the prior 5-7. So naturally these systems won't seem as much of a leap as they did back in 2005 / 2006.
 

Lepton87

Platinum Member
Jul 28, 2009
2,544
9
81
No matter how you slice this though, the PS3 (and the Xbox) GPU's were in no way top of the line at release. They were at best upper midrange in comparison to PC video cards. At that time, midrange was really a $100-$150 card.

While I agree in the PS3 case I'm not so sure in Xbox 360 case, the best GPU on the market when it was released was R580 on 1900XTX and 1950XTX which had GDDR4 memory, the only card to use them. So the silicon was comparable but PC cards were faster clocked (650MHz vs 500MHz Xenos) and had more memory bandwidth then the whole Xbox360, but Xenos was a newer unified architecture. Both had 48 shaders. Then there was GeForce 7950 GX2 which was dual GPU card and was obviously faster in terms of raw FPS. Due to power limits and cost we will never again have a console with a GPU that could rival PC's best.
 
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shady28

Platinum Member
Apr 11, 2004
2,520
397
126
While I agree in the PS3 case I'm not so sure in Xbox 360 case, the best GPU on the market when it was released was R580 on 1900XTX and 1950XTX which had GDDR4 memory, the only card to use them. So the silicon was comparable but PC cards were faster clocked (650MHz vs 500MHz Xenos) and had more memory bandwidth then the whole Xbox360, but Xenos was a newer unified architecture. Both had 48 shaders. Then there was GeForce 7950 GX2 which was dual GPU card and was obviously faster in terms of raw FPS. Due to power limits and cost we will never again have a console with a GPU that could rival PC's best.

Well, I'm really saying the PS3 and the Xbox 360 didn't rival PC's best at the time anyway

But yes, it does look like the new consoles will be farther away from the best than the last gen was at release.

On the other hand, the 'best' today is far more extreme than it was back then. It kind of hit me the other day looking at Frys. A GTX 660, which is supposedly a 'mid tier' graphics card like a x6xx Nvidias have always been, costs upwards of $250 unless you mail order it.

The 8600GT was released with an MSRP of $150 in 2007.

I'm just not sure that the market is the same one that existed back in 2006, or that these cards that we call 'mid range' are really all that mid range.

It feels like the GPU market has moved upscale, alienated itself, and is now in danger of becoming irrelevant in the face of IGP and APU type systems.
 

Fox5

Diamond Member
Jan 31, 2005
5,957
7
81
Well, I'm really saying the PS3 and the Xbox 360 didn't rival PC's best at the time anyway

But yes, it does look like the new consoles will be farther away from the best than the last gen was at release.

On the other hand, the 'best' today is far more extreme than it was back then. It kind of hit me the other day looking at Frys. A GTX 660, which is supposedly a 'mid tier' graphics card like a x6xx Nvidias have always been, costs upwards of $250 unless you mail order it.

The 8600GT was released with an MSRP of $150 in 2007.

I'm just not sure that the market is the same one that existed back in 2006, or that these cards that we call 'mid range' are really all that mid range.

It feels like the GPU market has moved upscale, alienated itself, and is now in danger of becoming irrelevant in the face of IGP and APU type systems.

The most graphically demanding games in the 2006-2008 time period... are pretty much still among the most graphically demanding games today. AMD's top end APUs offer performance on par with the 8800gt level of hardware, yet games haven't really demanded more performance than that.
 

FalseChristian

Diamond Member
Jan 7, 2002
3,322
0
71
Why don't they use, say, an Intel i5 2500K and overclock it to 4.5GHz as it needs little voltage to achieve this speed. As for the GPU why not use a Radeon HD 7870 XFire?

Sure, it's gonna cost $800 but those console types will pay whatever Microsoft or Sony tell them to pay.

This way you have a console that rivals today's modern PCs and the ports will be alot better graphically then they are now compared to PC-only games.
 

NTMBK

Lifer
Nov 14, 2011
10,269
5,134
136
Well, I'm really saying the PS3 and the Xbox 360 didn't rival PC's best at the time anyway

But yes, it does look like the new consoles will be farther away from the best than the last gen was at release.

On the other hand, the 'best' today is far more extreme than it was back then. It kind of hit me the other day looking at Frys. A GTX 660, which is supposedly a 'mid tier' graphics card like a x6xx Nvidias have always been, costs upwards of $250 unless you mail order it.

The 8600GT was released with an MSRP of $150 in 2007.

I'm just not sure that the market is the same one that existed back in 2006, or that these cards that we call 'mid range' are really all that mid range.

It feels like the GPU market has moved upscale, alienated itself, and is now in danger of becoming irrelevant in the face of IGP and APU type systems.

It's not just price which has headed northwards- look at how the power draw of top end graphics cards has ballooned since then, too. An 8800GT was a 105 W card, a GTX 680 is a 195W card. Good luck fitting that into a console!
 

NTMBK

Lifer
Nov 14, 2011
10,269
5,134
136
Why don't they use, say, an Intel i5 2500K and overclock it to 4.5GHz as it needs little voltage to achieve this speed. As for the GPU why not use a Radeon HD 7870 XFire?

Sure, it's gonna cost $800 but those console types will pay whatever Microsoft or Sony tell them to pay.

This way you have a console that rivals today's modern PCs and the ports will be alot better graphically then they are now compared to PC-only games.

LOL!



...wait, that was a joke, right?
 

tulx

Senior member
Jul 12, 2011
257
2
71
Why don't they use, say, an Intel i5 2500K and overclock it to 4.5GHz as it needs little voltage to achieve this speed. As for the GPU why not use a Radeon HD 7870 XFire?

Sure, it's gonna cost $800 but those console types will pay whatever Microsoft or Sony tell them to pay.

This way you have a console that rivals today's modern PCs and the ports will be alot better graphically then they are now compared to PC-only games.

Heh. That defeats the point of consoles. A lot of people buy consoles instead of gamin PC's because they are a lot cheaper and (sadly) often offer the same gaming experience. If they price them that high MS and Sony might as well just sell pre-built gaming PC's.
 

ShintaiDK

Lifer
Apr 22, 2012
20,378
145
106
Heh. That defeats the point of consoles. A lot of people buy consoles instead of gamin PC's because they are a lot cheaper and (sadly) often offer the same gaming experience. If they price them that high MS and Sony might as well just sell pre-built gaming PC's.

The PS3 BOM cost was what at the start, 800-850$?
 

SlowSpyder

Lifer
Jan 12, 2005
17,305
1,001
126
Why don't they use, say, an Intel i5 2500K and overclock it to 4.5GHz as it needs little voltage to achieve this speed. As for the GPU why not use a Radeon HD 7870 XFire?

Sure, it's gonna cost $800 but those console types will pay whatever Microsoft or Sony tell them to pay.

This way you have a console that rivals today's modern PCs and the ports will be alot better graphically then they are now compared to PC-only games.


Because Nintendo, Sony, and MS don't buy chips to overclock them, they buy real SKU's by the thousands and millions. And for Intel to sell a 4.5GHz quad, it would be pricey.
 

Red Hawk

Diamond Member
Jan 1, 2011
3,266
169
106
So, the PS4 will essentially have a slightly downclocked Radeon HD 7850 in it. I think that's great news, and much better than the Radeon HD 6670 rumors that were floating around. It's shooting a little lower than what the 360/PS3 tried upon release, as they essentially had the very top-end chips from each company while the 7850 is the current mid-tier chip from AMD. Still, it will support the latest graphics and compute features, and will be leaps and bounds ahead of current consoles. Thanks to console optimizations, I'd say there's a good chance that practical performance will exceed that of a full Radeon HD 7870 on desktops.

There's still two concerns here: first of course is the CPU, but then there is the memory bandwidth issue. An 8 core AMD CPU designed for tablets is not the most tantalizing proposition, especially at the given clock speeds, but I'd be willing to bet that some sort of turbo will be in place allowing half or more of the cores to be power gated allowing the rest to upclock. Memory bandwidth is something we have no information on at the time, but one of the big issues that held the previous console generation back was memory bandwidth -- the GPUs in each console were essentially neutered with half the bandwidth of their desktop counterparts or less. I hope we get a 7850's full bandwidth in the PS4, or at least a worthwhile eDRAM solution to make up for reduced bandwidth.
 

quest55720

Golden Member
Nov 3, 2004
1,339
0
0
The PS3 BOM cost was what at the start, 800-850$?

That caused the PS3 to be 599.99 and cost them a ton of market share. It let MS get its foot in the door in NA and the UK. Sony also lost every dime they made on gaming from the PS1 and PS2 because of it. Lets not forget that 200 of the BOM was forced on them by the highest level executives. Those executives who were still bitter over losing the format war to VHS and were not going to let it happen again. They sacrificed the PS3 to win the HD disk format war. The ironic thing is bluray was going to win out anyways and DD/streaming has slowed down sales of physical media.
 

VirtualLarry

No Lifer
Aug 25, 2001
56,452
10,120
126
Sure, it's gonna cost $800 but those console types will pay whatever Microsoft or Sony tell them to pay.

I don't think that the console market is that inelastic. One of the reasons for the widespread popularity, especially among "casual gamers", of the Wii, is that it debuted with a much more sane price-point for a console, compared to its competitors.

(Was the Wii $350 upon release? Or $250? I know it's like $150 or less now.)

Sony PS3 was like $600 or $800 when it first came out.
 

cplusplus

Member
Apr 28, 2005
91
0
0
Memory bandwidth is something we have no information on at the time, but one of the big issues that held the previous console generation back was memory bandwidth -- the GPUs in each console were essentially neutered with half the bandwidth of their desktop counterparts or less. I hope we get a 7850's full bandwidth in the PS4, or at least a worthwhile eDRAM solution to make up for reduced bandwidth.

The rumor is 4GB of either GDDR5 or stacked DDR3, and I believe the rumored bandwidth is like 176 GB/s.

edit: For the PS4. The next Xbox is rumored to have DDR3 + eDRAM/eSRAM.
 
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