As you can see again, most of today's games do not need 1 gigabyte of graphics memory. 896 megabytes is quite enough even at the highest resolutions. Perhaps 1GB or more memory may come in handy for GPGPU applications but games are a different story. In this particular case overclocking is useless, too. The GeForce GTX 275 delivers comfortable performance at every resolution up to 2560x1600 even at its default frequencies.
We had some hope about Crysis Warhead, yet this game seems to be quite satisfied with 896 megabytes of local graphics memory, too. The effect from the double amount of memory can only be seen at 2560x1600 but it is small and useless due to the overall low performance of the card.
Now you can opt to drop another 50 USD for the 1792 MB of memory, but the reality is simple .. we tried hard, really hard to show the performance benefit of that phat increase in graphics memory. The reality however is that only at 2560x1600 at very hefty AA modes there's small difference measurable here and there in stringent conditions. Now we really had to reconfigure our games to be able to show you that difference.
So from that perspective, the additional 896MB of memory I'm afraid does not make much sense. Things might change though, I mean if history learned us one lesson, it's that the demand for framebuffer (graphics memory) doubles up roughly every two years. So in the long run the extra framebuffer will show some advantages. But sure it's relative alright.
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