stickmansam :
well I tend to consider MIR's in my comparison as they can change things quite a bit sometimes though one may argue they are not always reliable
well it depends how much the memory bandwidth issue is apparent at 900p and its just as likely to run out of vram before the memory bottleneck becomes to much of an issue since these are 1gb cards
MIR's are not only not reliable, but usually not in cash and thus not deductible from the cost unless they are spent as well and then, they don't negate the cost of the original purchase, they merely let you spend get a little more afterwards. They don't change how much you pay to get the card and AMD's Never Settle deal is easily usable in any argument involving MIRs being included and completely throws AMD the advantage at that point.
The 650 Ti does not have enough performance to run out of memory capacity whereas the memory bandwidth is a constant problem. Memory bandwidth hurts MSAA scaling as well as scaling of increasing texture quality and many other such settings if the memory bandwidth is too low like it is for the 650 Ti. Unless you artificially inflate the test to the 650 Ti's favor, it usually only shows to be at best one tier about the 7770 in Tom's tiered hierarchy whereas the 7850 is generally two tiers above it.
stickmansam :
^^ well crysis 3 tags my card at 1080p high settings and 2xmsaa to 1.7gb of vram
those results were with a 2gb 7850
if you look at the 1680x1050 the 650ti either matches the 7850 or fall to about half
the fps when mem/bandwidth bottlenecked
the 7770 either is close to matching the 650 or falls quite a bit short of the 650ti when there is no mem/bottleneck issue and the 650ti can stretch its legs
that asus 650ti semi proves my point since it is 22% faster than the 7770 but 22% slower than the 7850 (its an oc card as the stock 650ti performs 5% worse, but notice its mem speed is not bumped only the core is)
[review was with older drivers so amd is likey doing a bit better now]
There is a huge difference between using x amount of memory and running into a memory capacity bottle-neck. Games often use much more memory than is needed to stop a memory capacity bottle-neck when that much memory is available. For example, although you may use 1.7GB in your situation, your card probably only needs around half that to run that situation properly.
The 650 Ti oly gets near the 7850 in 1600x900/1600x1050 when the tests haven't been adjusted for the performance deficit between those resolutions and 1080p. For example, you can pump up the MSAA on the 7850 without much performance loss at all, greatly reducing the increased tearing from the lower resolution, whereas you can not do that on the 650 Ti without a huge performance drop. The 7770 also doesn't suffer nearly as large of a performance drop as the 650 Ti.
Also, just for clarification, current testing shows that the 7850 is the lowest-end video card that can make use of more than 1GB of graphics memory and even then, only in very few situations does the 2GB model have an advantage over the 1GB model at stock and even then, that issue is easily alleviated by changing the settings around a little. Overclocking would change that around to giving the 2GB model much more of an advantage, but no amount of overclocking lets the 650 Ti need more than 1GB.
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