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AMD RX 480 Review Thread - Page 221

post #2201 of 3674
I have figured something out... the reason that Polaris suffers from a texture filtering bottleneck is not due to the amount of Color ROPs (or ROPs for short) but rather due to the amount of Z Stencil ROPs (found in the Render Back End units).

Basically... Polaris could be MUCH more powerful if it moved to 16 RBEs rather than 8 RBEs. In doubling the amount of RBEs you effectively increase the amount of texture filtering performance to an even greater degree. Right now Polaris is stuck at up to 119 GTexel/s when handling int8 texture filtering loads. This figure can be doubled by simply moving to 16 RBEs. Polaris has 128 Z/Stencil ROPs so it really can only function at up to 128 GTexels/s when handling Int8 texture filtering duties. If you move to 16 RBEs you get a boost to 256 GTexels/s. If you move to 24 RBEs (96 Color ROPs and 384 Z/Stencil ROPs) you boost up to 384 GTexel/s and so on and so forth.




See the Fury-X has 16 RBEs and thus can reach 249 GTexels/s (just shy of its 256 GTexel/s maximum).


The RBEs are tied directly to L2 Cache and a memory controller. Therefore the more L2 Cache (or the faster your memory controller as well as Framebuffer) then the least likely you are to bottleneck the theoretical throughput of your Z/Stencil ROPs.


This is likely why AMD have tweaked the cache on Polaris as well as increased the Cache in order to ensure that it delivers near maximum throughput (119/128 is very good tbh).

What this means for Vega... Well if Vega comes with 4096KB of L2 Cache (4MB) then we can expect there to be no Texture Filtering Bottlenecks. One can assume that Vega will have 16 RBEs (like Fury-X before it) and potentially one of the two Vega variants could even have more of these units. If that is the case then we would have grounds for a tough card to beat... it would take a GTX 1080 Ti.

AMD do not even need 1600 or 1800 Mhz at that. At 1266 MHz a Vega GPU with double the RBEs and a healthy increase in terms of CUs (Of course AMD is skipping GDDR5x and going straight to HBM2 for both Vega SKUs) would effectively compete with a GTX 1080 running its ridiculously high clocks (most probably beating it). This is doable.
Edited by Mahigan - 7/2/16 at 10:11pm
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post #2202 of 3674
Of course Vega would consume more power than Pascal but for high performance... who cares? (plus HBM2 will mitigate some of that extra power usage anyway).

Two RX 480s at 1266 MHz in crossfire are already capable of competing with a GTX 1080 when Crossfire works. As we know... Crossfire replicates texture Data so that means that two RX 480s are not even benefiting from the doubling of Z/Stencil ROPs and/or Texture Units.

If AIB RX 480s are able to clock past 1400MHz and beyond then a Vega GPU stuck at 1200-1300 MHz tops would compete with with a GTX 1080 and beyond.

It looks to me like nVIDIA have also hit a wall in terms of how high they can clock their GPUs (like a Pentium 4 basically). So Pascal going to a GTX 1080 Ti would mean much lower clocks than those currently enjoyed by the GTX 1070 and 1080 GPUs.

My prediction is that AMD will win this round. As unlikely as it sounds... if they effectively do double the RBEs/ROPs and and add a healthy amount of CUs coupled with HBM2 memory. Both high end Vega SKUs are set to give nVIDIA quite the headache if this all turns out to come to fruition.
Edited by Mahigan - 7/2/16 at 10:25pm
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post #2203 of 3674
Quote:
Originally Posted by BiG StroOnZ View Post

Sapphire RX 480 Nitro is looking pretty slick:
Quote:
Originally Posted by BiG StroOnZ View Post

Sapphire RX 480 Nitro is looking pretty slick:






Wow that is pretty, if it clocks like a champ i guess this is the one i will be getting.... tho i just dont think i can keep it air cooled. Time to hop on solidworks and whip up a full cover block biggrin.gif
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post #2204 of 3674
AIB 480's can't get here fast enough! Can't wait to bench the crap out of mine! RIP P67 Sabertooth! biggrin.gif
post #2205 of 3674
Quote:
Originally Posted by Majin SSJ Eric View Post

AIB 480's can't get here fast enough! Can't wait to bench the crap out of mine! RIP P67 Sabertooth! biggrin.gif

 

Careful! I was walking through a shop with a few 480's in stock and my mobile phone exploded.

     
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post #2206 of 3674
Anyone knows when AIB versions will arrive?
post #2207 of 3674
Quote:
Originally Posted by Themisseble View Post

Anyone knows when AIB versions will arrive?
This or next week probably. Sapphire said "July"
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post #2208 of 3674
So for someone who doesn't care about power efficiency, should they get an RX480 or get a used 290x/390 (or even just 290) if they're going to keep it for quite a while? it's preferable to buy now over reference waiting for aftermarket...and I'm kind of underwhelmed wither certain aspects of the RX480.


(don't know whether this is completely Off-topic or not)
post #2209 of 3674
Quote:
Originally Posted by LAKEINTEL View Post

So for someone who doesn't care about power efficiency, should they get an RX480 or get a used 290x/390 (or even just 290) if they're going to keep it for quite a while? it's preferable to buy now over reference waiting for aftermarket...and I'm kind of underwhelmed wither certain aspects of the RX480.


(don't know whether this is completely Off-topic or not)

Compare the DX12 performance of these cards and see which one performs better and get that as we will get ever more DX12 and Vulkan games from now on. If their performance is the same then get whatever's cheaper.

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post #2210 of 3674
I'm waiting for the Non Reference models. I'm hoping that a reputable brand will put out something that I just can't live without....
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