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Discussion on Article:
AMD Radeon HD 6790 Graphics Card Review

Started by: genie | Date 05/06/11 04:57:06 PM
Comments: 12 | Last Comment:  12/21/15 11:24:48 AM

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"The diagram makes it clear that the Radeon HD 6790 is inferior to the GeForce GTX 550 Ti in but a few tests"

On page 11, I think you meant to say Radeon HD 6790 is superior, not inferior. Otherwise it beating the 550 Ti by 13.3% on average doesn't make sense.
0 2 [Posted by: genie  | Date: 05/06/11 04:57:06 PM]

The extrapolation about HD 6790 really being 128-bit, but boosted by Southern Islands VLIW4 architecture:

The statistics would have been far less misleading and confusing to customers, but we're being fooled by the exaggerated response times of LCD panels as well (2ms when it's only for a certain shade of G2G, far from the average of 16ms, 600Hz refresh rate when it's just strobe backlighting, etc..).

Else, a comprehensive "horsepower" rating for video cards done by an independent 3rd-party would help to keep things in perspective if one does not want to study 100 benchmark charts from different sites before buying a video card:
0 0 [Posted by: Bo_Fox  | Date: 05/08/11 11:34:31 AM]

6790 is old VLIW5 architecture but split SIMD processing area into 2 blocks and the GPU has it's own dispatch processor, intruction and data cache to improve parallelism. All Barts gpu are true 256-bit memory bus width not 128-bit.
0 0 [Posted by: beautyless  | Date: 05/08/11 07:27:10 PM]
- collapse thread

The SIMD processing area was already split in the Cypress. The link you gave me does not say it's VLIW5. All it says is that the two split areas now have their own dispatch processor, instructor and constant caches. The parallelism is increased, but in theory it should only yield about 3% in overall performance with todays' games in general. This does not account for the nearly 20% increase that only makes sense with the VLIW4 architecture.

Barts LE with its sawed-off 16 ROPs might still have 256-bit memory traces on the PCB, but only be able to access 128-bit per given cycle since the ROPs are linked to the bus. Thus, it's more appropriate to call it 128-bit like AMD did with their HD 4730's. The first link that I gave you above should cover quite a bit.
0 0 [Posted by: Bo_Fox  | Date: 05/11/11 06:26:03 AM]


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