Question Speculation: RDNA2 + CDNA Architectures thread

[uzzi38]

All die sizes are within 5mm^2. The poster here has been right on some things in the past afaik, and to his credit was the first to saying 505mm^2 for Navi21, which other people have backed up. Even still though, take the following with a pich of salt.

Navi21 - 505mm^2

Navi22 - 340mm^2

Navi23 - 240mm^2

Source is the following post: https://www.ptt.cc/bbs/PC_Shopping/M.1588075782.A.C1E.html

 

[TESKATLIPOKA]

True, I checked It once more using the measured average clockspeed from the review and It's almost linear in 4K.

edit:
I checked also Polaris RX 460 vs RX 470 and there we can see a difference. Vega doesn't have a halved version.
ASUS Radeon RX 460 STRIX OC 4GB Review vs ASUS Radeon RX 470 STRIX OC 4 GB Review
Specs:
TFLOPs: 2.262Tflops vs 4.706Tflops (+108%)
Clockspeed: 1262Mhz vs 1149Mhz (-9%)
CU: 14 vs 32 (+129%)
ROP: 16 vs 32 (+100%)
Bandwidth: 112GB/s vs 211GB/s (+88%)

Performance difference:
FullHD: +79%
WQHD: +82%
4k: +76%

 

[leoneazzurro]

I already did these calculations, scaling is above 90% (around 93-95%) of the ideal linear scaling going from 5500XT to 5700XT (and not only in 4K but at lower resolutions as well - except one or two outliers on around 20 games suite).

 

[TESKATLIPOKA]

Now the question is what is the scaling of performance moving from 40CU to 80CU.

 

[leoneazzurro]

Of course, another issue with prediction is that there will be for sure changes in the architecture that may affect performance in a positive or negative way. I.e. the rumors about a narrow bus may point to a negative factor, utlization in a CU should increase, and there was a rumor about a complete overhaul of RBEs

 

[TESKATLIPOKA]

Bondrewd from beyond3d was the one saying RBEs will be overhauled, but he is already banned for 2 months, so we will have to wait and see.

 

[leoneazzurro]

Well not only that, there was Katcorgi or Rogame (sorry, I don't remember who) saying Big Navi had 128 ROPs with fewer RBE partitions... Pointing to something fishy going on on that side

 

[Krteq]

Yeah, even codenames are quite "fishy"

 

[leoneazzurro]

Yeah, even codenames are quite "fishy"

That maybe is a "Hint" from AMD to not trust rumors lol

 

[CastleBravo]

Frank Azor posted a couple tweets. He seems confident about RDNA2 supply at launch.

https://twitter.com/x/status/1309134647410991107

https://twitter.com/x/status/1309135810495684613

 

[GodisanAtheist]

Now that the 3090 reviews are out, it looks like straight doubling of 5700xt performance will put AMD in a competitive position with NV's entire stack for 1080 and 1440p at least, and within striking distance of the 3090 at 4k (although falling a bit short).

 

[beginner99]

Frank Azor posted a couple tweets. He seems confident about RDNA2 supply at launch.

https://twitter.com/x/status/1309134647410991107

https://twitter.com/x/status/1309135810495684613

Well its seems given 3090 reviews AMD actually has a shot to take the crown.

 

[Kenmitch]

Well its seems given 3090 reviews AMD actually has a shot to take the crown.

What....Hell has a chance of freezing over? /s

 

[Hitman928]

Frank Azor posted a couple tweets. He seems confident about RDNA2 supply at launch.

https://twitter.com/x/status/1309134647410991107

https://twitter.com/x/status/1309135810495684613

There is so much demand right now for components / home electronics that I wouldn't expect supply to be able to meet demand initially, but if more than a handful of 'regular' people can get their hands on one on launch day, that would probably be a big win at this point.

 

[CastleBravo]

Now that the 3090 reviews are out, it looks like straight doubling of 5700xt performance will put AMD in a competitive position with NV's entire stack for 1080 and 1440p at least, and within striking distance of the 3090 at 4k (although falling a bit short).

If Navi21 has right at 2x Navi10's 4k performance, it will be less than 2x on 1440 and 1080.

 

[CastleBravo]

There is so much demand right now for components / home electronics that I wouldn't expect supply to be able to meet demand initially, but if more than a handful of 'regular' people can get their hands on one on launch day, that would probably be a big win at this point.

Well, it is possible that he knows demand for RDNA2 will be exceptionally poor

 

[Kenmitch]

Well its seems given 3090 reviews AMD actually has a shot to take the crown.

The 3090 moved the bar in a diagonal line it looks like. Ampere looks to be tapped out, maybe down for the count?

 

[Hitman928]

Well, it is possible that he knows demand for RDNA2 will be exceptionally poor

LoL, I guess that is one way to help ensure you have sufficient supply

 

[GodisanAtheist]

If Navi21 has right at 2x Navi10's 4k performance, it will be less than 2x on 1440 and 1080.

- The 5700xt experienced some non-linear performance drop off at 4K resolutions. My expectation/hope is that we see double performance at 1080/1440 and *better* than double performance at 4K as big-navi becomes less CPU bound.

This would not be unlike what we see with the 3080/3090 that really start stretching their legs at the 4K res.

AMD is just starting from so much further behind, which makes it less believable/likely to happen...

 

[dzoni2k2]

AMD is just starting from so much further behind, which makes it less believable/likely to happen...

I would say they are far closer to Nvidia than they were to Intel before Zen.

 

[exquisitechar]

- The 5700xt experienced some non-linear performance drop off at 4K resolutions. My expectation/hope is that we see double performance at 1080/1440 and *better* than double performance at 4K as big-navi becomes less CPU bound.

This would not be unlike what we see with the 3080/3090 that really start stretching their legs at the 4K res.

AMD is just starting from so much further behind, which makes it less believable/likely to happen...

Yeah, it'll be more than 2x 5700XT performance at 4k.

 

[blckgrffn]

What....Hell has a chance of freezing over? /s

Climate change?

Can't wait for the 8th and darn it all this launch. Let's go.

 

[Timorous]

- The 5700xt experienced some non-linear performance drop off at 4K resolutions. My expectation/hope is that we see double performance at 1080/1440 and *better* than double performance at 4K as big-navi becomes less CPU bound.

This would not be unlike what we see with the 3080/3090 that really start stretching their legs at the 4K res.

AMD is just starting from so much further behind, which makes it less believable/likely to happen...

Is it really much further behind when they are starting with a 10.3B transistor die and RDNA performance per transistor is similar to Turing?

 

[Tup3x]

Interesting times ahead.

 

[CastleBravo]

Climate change?

Can't wait for the 8th and darn it all this launch. Let's go.

Climate change, lol. Is Lisa going to cry Uncle again, or are scientists going to need to come up with a new NACL forcing model when Lisa makes Uncle cry?

 

[TESKATLIPOKA]

I am really starting to wonder If the info about 505mm2 and 80CU is actually correct. For 80CU, 128ROPs and 512bit Rdna1 GPU I got only 461mm2 and that is with the same transistor density.
I personally don't believe density will stay the same so either die size is wrong or the number of CU.