I think some people are really underestimating the potential for improvements in efficiency of the GPU and memory controller, go back and look at some reviews of the 4670 vs. the 3800s. The GPUs are similar (SPs the same, TMUs are doubled on the 4670 but the ROPs are halved) but the memory bandwidth is vastly in favor of the 3800s - 128bit vs. 256bit, both DDR3/GDDR3 or faster, the 3870 generally having faster GDDR3, so that means the 4670 had a GPU that wasn't more powerful in terms of brute force given and was given less than half the memory bandwidth but it regularly places between the 3850 and 3870. Here the 5700s not only have a clearly superior GPU, the memory bandwidth situation isn't nearly as bad (more like 2/3 rather than
less than half).
I could very well be wrong but I'm not sure there's been much evidence to have so much doubt. At worst, the specs we're hearing about just aren't suggesting one of the best price/performance parts ever, that doesn't mean it won't be good.
That being said, the good news we can take away from the current rumors is that the 5750 might be the card to get of the 5700s if the sole difference is clockrate (especially if that difference can be made up with overclocking) also the 5850 retains a lot of its own value, making it a safe buy, especially for those with larger monitors and/or those considering triple monitor setups.
Originally posted by: Just learning
Originally posted by: bunnyfubbles
Originally posted by: Crisium
I'm guessing 5750 will be slightly faster than 4850 but slower than 4870. Then the 5770 will probably be about equal to 4870, perhaps better depending on it's exact specs. But I cannot see 4890 performance with 128-bit at 1120SP.
if they're not going to be faster there would be little reason to give them so many more SPs and TMUs
It could be ATI is waiting for the 7 Gbps DDR5 memory chips. This would be a 40% improvement over the 5 Gbps DDR5 chips being used now.
If this is true then ATI will be nicely positioned against Nvidia's midrange offering when they are released.
1120 stream processors on a 180mm2 die + 7 Gbps DDR5 would be a very tight efficient package.
Maybe call this 7 Gbps memory Juniper "HD5790"????
My comment that you're replying to is assuming price points of $150 and $200. If these cards cant at least match a 4870 and 4890 respective, there's really no point in having them, certainly not at those prices. They'd have been better off with an 800-960SP set at lower prices.
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