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[fudzilla]No GDDR5 support on Kaveri - Page 2

post #11 of 29
The memory bandwidth constraints won't be lifted until DDR4 hits, but generally speaking the move to the GCN architecture for the GPU combined with support for higher memory clocks and an improved memory controller will grant much better performance than the previous gen APU's, is what I was getting at.
post #12 of 29
I've been desperately trying to find 7750 DDR3 benchmarks. The top-end Kaveri should probably perform similarly if equipped with DDR3-1600 (of course this is not factoring in the CPU's IMC usage, overhead from the northbridge etc).

AMD equipped the 7750 with GDDR5 good for about 72GB/s of bandwidth. My feeling is that Carizzo will have the same shader count and dual/quad channel DDR4.
post #13 of 29
we have all known that AMD's iGPU have been memory starved as they all perform alot better with faster memory. system memory is never going to catch up to the speed of their iGPU's. they NEED on-die cache like in the XB1 or dedicated memory lanes for the iGPU.
post #14 of 29
The X1's performance has already shown that their EsRAM doesn't do much at all for the performance. Games are still in lower resolutions than their PS4 counterparts and of noticeable visual inferiority as well. It doesn't magically boost performance in any meaningful way.

DDR4, especially once higher clocks begin getting reached will be enough for the iGPU, especially if they make tri- or quad-channel boards.
post #15 of 29
I always thought it would make sense to just wait for DDR4 to launch then to wait for GDDR5 modules.
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SR388
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post #16 of 29
Quote:
Originally Posted by NaroonGTX View Post

The X1's performance has already shown that their EsRAM doesn't do much at all for the performance. Games are still in lower resolutions than their PS4 counterparts and of noticeable visual inferiority as well. It doesn't magically boost performance in any meaningful way.

DDR4, especially once higher clocks begin getting reached will be enough for the iGPU, especially if they make tri- or quad-channel boards.

EsRam is fine and dandy. But why xbone is lower res, is for another reason entirely, and it is significant. The xbone has 768 GPU cores vs PS4's 1152 cores. Thats like going from 7850 to 7950...or 7790 to 7870 etc...PS4 LITERALLY has 50% more gpu cores. No amount ESRAM can overcome that unfortunately. MS opted for a cheaper APU, hence they had it coming. Not to mention the DDR3 bottleneck.
post #17 of 29
Well actually a cache would really help, you could save a ton of memory bandwidth by prefetching assets into the cache and having the framebuffer there as well. Xbox One developers have low-level control of 32MB ESRAM so they would have to specifically target it to get the benefit - I don't think games have been optimized at that level yet.

Another point is that the Iris Pro cache is simply a victim cache for L3 and AFAIK developers have little to no direct control over it. AMD might emulate this approach for higher end chips but I think it would be unnecessary if they simply adopted a quad-channel DDR4 interface.
Quote:
Originally Posted by NaroonGTX View Post

The X1's performance has already shown that their EsRAM doesn't do much at all for the performance. Games are still in lower resolutions than their PS4 counterparts and of noticeable visual inferiority as well. It doesn't magically boost performance in any meaningful way.

DDR4, especially once higher clocks begin getting reached will be enough for the iGPU, especially if they make tri- or quad-channel boards.
post #18 of 29
Quote:
Originally Posted by NaroonGTX View Post

The X1's performance has already shown that their EsRAM doesn't do much at all for the performance. Games are still in lower resolutions than their PS4 counterparts and of noticeable visual inferiority as well. It doesn't magically boost performance in any meaningful way.

DDR4, especially once higher clocks begin getting reached will be enough for the iGPU, especially if they make tri- or quad-channel boards.

Just read an article that disagrees with the visual inferiority. They had side by side comparisons. (looked for it but can't find it now. Might have been engadget) it;s 720p vs 900p. The problem with 900p is that it's rarely a format that TVs support, so even if it was visually better, most folks still wouldn't be able to take advantage.
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post #19 of 29
Most games will look the same, but there have been comparisons where the X1 version looks noticeable worse. I haven't been following too closely but apparently BF4's MP on PS4 looks better than X1's SP mode, stuff like that. Also how CoD Ghosts runs in 1080p60fps on PS4 but it's at 720p on X1 for some reason, despite the game being visually unimpressive by nearly all standards, lol.

We won't see the two systems pull apart much in multi-plats, but it will be the first-party exclusives that show the power of the respective systems as usual.
post #20 of 29
the thing I want to know most about they have talked about least. i'm not following the relative console strengths so much as I am fascinated by the raw potential of the Kinect technology. In theory, it could be truely astounding and change not only gaming, but all computing. not sure how much of it will be realized though.
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