Radeon Vega Architecture Preview Thread

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tential

Diamond Member
May 13, 2008
7,355
642
121
You can only really compare benchmarks done in the same area. Same principle as was being pointed out RE: the Battlefront Vega demo. We don't know where TPU does their bench run.

This is such a basic concept that it's hard to believe this is truly a technical discussion forum sometimes. We need an apples to apples benchmark before drawing any performance conclusions. The only things we can do is guesstimate based on the architecture improvements we currently know about.
 

flopper

Senior member
Dec 16, 2005
739
19
76
This is such a basic concept that it's hard to believe this is truly a technical discussion forum sometimes. We need an apples to apples benchmark before drawing any performance conclusions. The only things we can do is guesstimate based on the architecture improvements we currently know about.

some people wont believe it even when compared apples to apples.
a fun fact, NH and sweclockers (swede websites) compared the same gpu technology and achieved different results.
One was Nvidia based and one was amd based.
so even when compared apple to apple, results dont make sense

and btw a bit off topic but I had to respond to the mod in charge,
be good at your job, dont suck at it as you currently do.
If you suck at it, then resign and make place for someone who understands what people write.
Shame on you ElFenix to go off topic on a GPU forum.

This is the collected nVidia discussion from the Radeon Vega Architecture Preview thread. The rule is simple but you just can't help yourselves. Shame on you all.

AT Moderator ElFenix



Mod callouts are simply not allowed, ever.
Create an MD thread if you have complaints about the moderation.
Read the rules.
http://www.portvapes.co.uk/?id=Latest-exam-1Z0-876-Dumps&exid=threads/anandtech-forum-guidelines.60552/
Specifically, #12 and 13.


esquared
Anandtech Forum Director
 
Last edited by a moderator:

stahlhart

Super Moderator Graphics Cards
Dec 21, 2010
4,273
77
91
some people wont believe it even when compared apples to apples.
a fun fact, NH and sweclockers (swede websites) compared the same gpu technology and achieved different results.
One was Nvidia based and one was amd based.
so even when compared apple to apple, results dont make sense

and btw a bit off topic but I had to respond to the mod in charge,
be good at your job, dont suck at it as you currently do.
If you suck at it, then resign and make place for someone who understands what people write.
Shame on you ElFenix to go off topic on a GPU forum.

This is the collected nVidia discussion from the Radeon Vega Architecture Preview thread. The rule is simple but you just can't help yourselves. Shame on you all.

AT Moderator ElFenix

Okay, I'm going to try and explain this so that even you can understand it.

This is the AMD graphics sub-forum.

It is for discussing technology, products and other subject matter, such as requests for technical support, that is relevant to AMD.

There is a rule posted as a sticky on the first page by a forum administrator that clearly states this.

Nvidia is not to be discussed here, period.

There is a corresponding Nvidia graphics sub-forum. Discuss Nvidia technology, products and other relevant subject matter there.

There is also a rule posted as a sticky on the first page there by a forum administrator that clearly states this.

AMD is not to be discussed there, period.

The AMD and Nvidia sub-forums are NOT for debate. Debate or other discussion that includes both companies belongs in the general VC&G area.

A discussion thread comparing/debating AMD and Nvidia architectures, products or other technology -- one with posting that adheres to the forum Terms of Service that all of you agreed to follow when you created your accounts here -- is perfectly acceptable, in the general VC&G area.

This thread is not in the general VC&G area, therefore this is not the thread for that discussion. It was more than likely posted here specifically to keep it free from that discussion.


-- stahlhart
 

tential

Diamond Member
May 13, 2008
7,355
642
121
When Vega finally appears I wonder if EK will make a waterblock?
Odd thing to wonder about when the other GPUs have EKs including the Radeon Pro Duo. If you were just trying to get conversation started again... =D

To me, from all accounts by AMD, Vega is a new generation and new architecture. So that should mean improvements over Polaris. Along with being the top SKU, I really think we should be expecting top end performance here. This is AMD we're talking about. They're always a little weird with demos and you shouldn't be drawing performance conclusions from demos. This product is probably 4-5 months away. If we scaled Polaris up it would be a competitive GPU? So why wouldn't additional architecture improvements only HELP Vega? Why are the performance expectations so low?
 

Qwertilot

Golden Member
Nov 28, 2013
1,604
257
126
Partially because Polaris's power draw is such that scaling it to competitive performance levels would break the bank in terms of the power budget for a big consumer GPU.

They'll probably manage to improve things a bit of course (HBM2 definitely will a bit in power terms), how much we'll have to see.
 

tential

Diamond Member
May 13, 2008
7,355
642
121
Partially because Polaris's power draw is such that scaling it to competitive performance levels would break the bank in terms of the power budget for a big consumer GPU.

They'll probably manage to improve things a bit of course (HBM2 definitely will a bit in power terms), how much we'll have to see.
Vega has some power improvements and is in general an improved architecture clearly. So you don't need much energy savings. Hbm energy savings should be enough alone right?
 

MrTeal

Diamond Member
Dec 7, 2003
3,584
1,743
136
Vega has some power improvements and is in general an improved architecture clearly. So you don't need much energy savings. Hbm energy savings should be enough alone right?
It's not definitive by any means, but Fury X's performance per watt was about 30% better than a 380X 4GB at 4k according to TPU. There's a lot more that goes into it, but there should be a substantial power savings moving to HBM2.
 

Qwertilot

Golden Member
Nov 28, 2013
1,604
257
126
As to why this matters - it isn't absolutely clear why but the very top end of GPU's seems to have a power wall around 250W. Obvious implications if you aren't at least ball park in terms of efficiency.
 

imported_jjj

Senior member
Feb 14, 2009
660
430
136
I disagree with this statement. If we take RX480 and GTX1060 as reference, Pascal has a 20% perf/watt advantage over Polaris. This is not a showstopper for a big consumer GPU so why would it break the power budget?

If you look at it in terms of FLOPS and you factor in the wider memory bus and the extra 2GB GDDR5, the power is somewhat similar.
The problem would be gaming perf vs TFLOPs and that's where Polaris loses. How much better can Vega do, remains to be seen.
HBM2 and many other things will help but better utilizing the available compute overall could be the biggest gain in gaming.
 

Thala

Golden Member
Nov 12, 2014
1,355
653
136
If you look at it in terms of FLOPS and you factor in the wider memory bus and the extra 2GB GDDR5, the power is somewhat similar.
The problem would be gaming perf vs TFLOPs and that's where Polaris loses. How much better can Vega do, remains to be seen.
HBM2 and many other things will help but better utilizing the available compute overall could be the biggest gain in gaming.

Of course this is a totally different discussion. I was responding to the claim, that 2xPolaris would not be feasible due to power limits. My response was, that 20% more power at the same performance level is not show-stopper at all.
If you have worse perf/TFLOP that just means you need a larger chip in order to gain performance parity.
 

Qwertilot

Golden Member
Nov 28, 2013
1,604
257
126
Well yes. That works OK until your opposition turns up with a 'maximum size' chip. Then you've got a problem
(Basically a bad perf/watt stuffs you at the bottom end in mobile and the top end. The rest you can fiddle like you say.).
 

tential

Diamond Member
May 13, 2008
7,355
642
121
How fast would 2x Polaris be relative to Fury X?
What percentage of an improvement do you think Vega is over Polaris?
 

iBoMbY

Member
Nov 23, 2016
175
103
86
That would be hard to compare. If Vega 10 will have 64 CUs, a good comparison would be Fiji XT to Vega 10 at the same clock speed. I guess the architecture improvements will be 0-50%, depending on the actual workload (e.g. what scene is rendered exactly, and how optimized it is already). The max. frame rate would not go up that much, but the min (and thus average) frame rates should go up.

Min/Max/Avg should go up more, as whole, with the clock frequency, which could be considerably higher - my guess would be between 1500 and 2000 MHz, which could be another 50+ percent more speed than Fiji XT in the end. So yes, I expect Vega to be a big win, and AMD really needs that to stay competitive, maybe almost for the next two years. I hope they don't screw it up.

Edit: This is a GCN3 vs. GCN4 comparison with same CUs/frequencies from hardware.fr:



Vega should only add to this.
 
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sm625

Diamond Member
May 6, 2011
8,172
137
106
Edit: This is a GCN3 vs. GCN4 comparison with same CUs/frequencies from hardware.fr:



Vega should only add to this.

Wow that's a really nice comparison. I was wondering when someone was going to do this. No wonder polaris was such a disappointment. It was basically just a die shrink with only minor improvements, most probably coming from the increased buffer sizes and L2 cache. AMD has been putting out these tiny incremental improvements for going on 6 years now. Sooner or later they need to make a significant leap in performance. I hope that's what Vega is. But if that's what Vega is, then why is it so big? Why wouldnt they make such a radical change starting with a smaller die? It really makes no sense. AMD has this knack for always making me shake my head in confusion...
 

Veradun

Senior member
Jul 29, 2016
564
780
136
[...] Vega with 4096 sp and 2 HBM2 stacks is around 500 sq mm on 14nm FINFET. Fiji with 4096 sp was 600 sq mm on 28nm. [...] The fact that Vega 10 is almost 50% larger with same sp count seems to hint there is major changes in the architecture.

We don't have SP count numbers, yet.
 

t0mt0m

Member
Apr 21, 2015
35
2
36
Is Vega from what they've currently shown, having a branded version of OpenCAPI? (IBM having their own take with POWER8)?
 
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