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AMD RX 480 Review Thread - Page 244

post #2431 of 3674
Quote:
Originally Posted by spyshagg View Post

Tess disabled on the 16k run iirc


same perf as my oced 290x, while consuming maybe 80watts less.


The chip clearly beats the 290x when both are inside their ideal perf/watts window. But once they are out, the rx480 hogs almost as much power the oced 290x for the same 16k score.


Clearly not designed to be scalable.
GCN really is designed to be a slow clocked wide GPU, not a small high clocked GPU like pascal is. Which baffles me as to why AMD didnt make it a bigger 40CU chip and clock it lower, the performance per watt sweet spot for GCN is under 1000MHz.
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post #2432 of 3674
Quote:
Originally Posted by GamerusMaximus View Post

GCN really is designed to be a slow clocked wide GPU, not a small high clocked GPU like pascal is. Which baffles me as to why AMD didnt make it a bigger 40CU chip and clock it lower, the performance per watt sweet spot for GCN is under 1000MHz.

Would not surprise me if they went 40CU for the RX 485.
post #2433 of 3674
Quote:
Originally Posted by GamerusMaximus View Post

GCN really is designed to be a slow clocked wide GPU, not a small high clocked GPU like pascal is. Which baffles me as to why AMD didnt make it a bigger 40CU chip and clock it lower, the performance per watt sweet spot for GCN is under 1000MHz.

That is the million dollar question. Though there is talk that it was intended to have 45CU and 2880 shaders, would have likely needed more other units to really use the extra CUs though. The block diagram also looks like it was going have 512b memory. Makes me wonder if it was supposed to be a 1 or 2 stack HBM2 chip that was redesigned for GDDR5.
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post #2434 of 3674
Quote:
Originally Posted by Waitng4realGPU View Post

There's two scores there, one with and one without the tessellation tweaks that will increase the score.

The accurate graphics score without cheats/tweaks is 15300 iirc.

"stock" drivers aka no tesselation tweaks etc.

Game stable? Yes. max 66°C core temp under water.
Edited by poii - 7/6/16 at 8:37am
post #2435 of 3674
Quote:
Originally Posted by KarathKasun View Post

That is the million dollar question. Though there is talk that it was intended to have 45CU and 2880 shaders, would have likely needed more other units to really use the extra CUs though. The block diagram also looks like it was going have 512b memory. Makes me wonder if it was supposed to be a 1 or 2 stack HBM2 chip that was redesigned for GDDR5.
It very well could have been. It could also be that those controllers are only 32 bit apiece, not 64 bit like they used to be. Either way, it seems polaris is not what it was first intended to be when development started.
Quote:
Originally Posted by Exeed Orbit View Post

Would not surprise me if they went 40CU for the RX 485.
That would require a new die, which AMD doesnt have yet. They could develop one, but it would take awhile to come to market.
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post #2436 of 3674
Quote:
Originally Posted by GamerusMaximus View Post

It very well could have been. It could also be that those controllers are only 32 bit apiece, not 64 bit like they used to be. Either way, it seems polaris is not what it was first intended to be when development started.
That would require a new die, which AMD doesnt have yet. They could develop one, but it would take awhile to come to market.

I will have to link the GPU die analysis I had seen. It shows that there are 45 CU's pn the existing P10 die. They could only be for redundancy though.

--edit--

Found it...
http://forums.anandtech.com/showpost.php?p=38336220&postcount=40

Looks like we have another Tonga on our hands. Chip with more capacity than will ever be exposed to the public.
Edited by KarathKasun - 7/6/16 at 8:41am
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post #2437 of 3674
Quote:
Originally Posted by KarathKasun View Post

I will have to link the GPU die analysis I had seen. It shows that there are 45 CU's pn the existing P10 die. They could only be for redundancy though.

--edit--

Found it...
http://forums.anandtech.com/showpost.php?p=38336220&postcount=40
Man, if AMD had a 2880 core 512 bit polaris chip, why on earth wouldnt they release it? That sounds much more tantalizing then the 480 turned out to be.

EDIT: reading the rest of that forum, the extra blocks are most likely TMUs, and the memory controllers are most likely 32 bit, not 64 bit like the older GCN cards.
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post #2438 of 3674
Quote:
Originally Posted by GamerusMaximus View Post

Man, if AMD had a 2880 core 512 bit polaris chip, why on earth wouldnt they release it? That sounds much more tantalizing then the 480 turned out to be.

Well, from those shots it looks like 384b. Tonga met the same fate.

Lots of disabled units to salvage yields.
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post #2439 of 3674
Quote:
Originally Posted by GamerusMaximus View Post

Man, if AMD had a 2880 core 512 bit polaris chip, why on earth wouldnt they release it? That sounds much more tantalizing then the 480 turned out to be.

Because they've hit the low/mid market and are selling by the thousand. I'm sure they are pushing their next release asap.
post #2440 of 3674
Quote:
Originally Posted by Waitng4realGPU View Post

What's the exact graphics score on your 290X at max OC?

Yeah efficiency really flies out the window at a certain point.


1180mhz
16005 graphics score

http://www.3dmark.com/fs/7865089





I was maybe using 350 watts at those low clocks (1180). So, not far off from RX480 (300)
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