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GCN v1.1 vs GCN v1.2

post #1 of 7
Thread Starter 
Hi,

I just read that Rise of the Tomb Raider supports async compute starting on GCN v1.1. I did some research on compute on Radeon HD 7970 GCB v1.0 and R9 280X v1.1. In synopsis: -

Compute queue limit support GCN v1.1 & 1.2 =64 GCN v1.0 =16
Multi engine concurrency GCN v1.1 & 1.2 =1 3D engine+upto 8 Compute engines; can seamlessly interleave commands from 8 async queues per engine V1.0 1 3D engine + upto 2 compute engines 8 queues per engine
3D shader concurrency execution slots dynamically shared between all command types GCN1.1.
Compute shader concurrency execution slots dynamically shared between all of the 8 compute queues since GCN 1.1.

My original belief was the GCN v1.1 was really much ado about nothing, when in fact there's a lot of work done to make compute useful and broaden it's appeal. It's as if they want the GPU to take more work from the CPU. I don't blame the internet hardware sites as nobody realised what was happening at the time as there attitude was GCN v1.1 move on nothing to see here. Seems like someone was laying the ground work to move more things of the CPU...Now my story I recently purchased 2 Sapphire Radeon HD 7970 Vapor-X cards for about £200 on Ebay. Why because I don't think the RX 480 / GTX 1060 / GTX 1070 are worth the money for performance they provide. I expect GTX 1070 performance for £300 not £400+. I'm not broke, I earn like over £300 a day and I have to work hard for that. So if you want my money I expect the same - I'm not a skin flint. I feel as if I'm being price gouged. Looking into the async compute/compute side of things I'm thinking of selling them and getting two R9 280x but you have to factor: -

A GPU must have free cycles available for async compute loads. If it's maxed out with graphics then it does have the free cycles to stick compute loads on the fly.
The biggest fillip for AMD GPUs in DX 12 is being able multi-thread the graphics processing, spreading the graphics load to multiple cores compared to being on just 1 in DirectX 11. That's the big win for AMD GPUs.
nVidia has work-around in the driver to have a thread on more than 1 core hence they always come out on top in DX11. So

These (dual 7970s) aren't the final solution waiting till something comes out in the market that is worth money. Though the dual 7970s/280x should perform better under DX12. I feel currently that AMD/nVidia want to charge too much for what they are offering. I expect GTX 1070 performance to come around £300 which it does in the States. I'm thinking of selling the 7970s on Ebay and getting dual R9 280x. I play a few games Elite Dangerous, Metal Solid TPP, GTA 5, Satellite Reign, The Long Dark & thinking about the new Deus Ex game - if it is as good as the original, probably pick up Crysis 3 at some point too. Only play in 1080P, like to max it out though. I'm currently using a single 7950 Vapor-X. What is your take on it?

Thanks
Haider

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GCN v1 should read 2 asynchronous compute units able to handle 8 queues each for a total of 16 queues.
Edited by HaiderGill - 7/28/16 at 1:20am
post #2 of 7
why would you buy the r9 280x GPUs, they are GCN1. and they are the same GPU that 7970 uses,you mean r9 290 or 290x
post #3 of 7
Thread Starter 
Quote:
Originally Posted by PontiacGTX View Post

why would you buy the r9 280x GPUs, they are GCN1. and they are the same GPU that 7970 uses,you mean r9 290 or 290x

Forgot to put my source in it http://ext3h.makegames.de/DX12_Compute.html

PS
You're right it should be r9 290x
Edited by HaiderGill - 7/27/16 at 3:36pm
post #4 of 7
Are games laggy for you? If so sell the 7970's and get the R9 290x's. If not stick with the 7970's till AMD's new cards come out and possibly the 1080Ti's so hopefully there is better prices and competition. Honestly for how old they are 7970's are beastly cards still and I run games still fine on mine, granted I don't run like 16xAA or anything I just run High/Very High settings on my monitor and that's that.
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Kardiac 2.0
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post #5 of 7
There has been no indication of async being properly implemented into that game, considering both nVidia and AMD lose performance in DX12 compared to DX11, unlike other games...
post #6 of 7
Thread Starter 
Quote:
Originally Posted by Chucklez View Post

Are games laggy for you? If so sell the 7970's and get the R9 290x's. If not stick with the 7970's till AMD's new cards come out and possibly the 1080Ti's so hopefully there is better prices and competition. Honestly for how old they are 7970's are beastly cards still and I run games still fine on mine, granted I don't run like 16xAA or anything I just run High/Very High settings on my monitor and that's that.

No idea yet I building another PC my current one is going to my child. First PC 7950 Vapor-X@1050 MHz & Core I5-760@3.6GHz. As a stop gap solution I'm getting 2 Radeon HD 7970 Vapor-X - thinking of DX12 explicit multi adapter support. I'll probably for for Vega at somepoint...
post #7 of 7
79x0 & 280X are the same exact card, based on Tahiti ASIC which uses GCN0 (or 1.0) architecture.
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