I hesitate to talk too much about overclocking, because we're testing a pre-production NVIDIA reference card, and any overclocking results we get don't prove much of anything. Still, since NVIDIA initially announced the GeForce4 Ti at two speeds, 275MHz and 300MHz, we're tempted to think nearly any GF4 Ti chip should hit 275MHz without much trouble. The late addition of the GF4 Ti 4200 is probably more about market demands than about binning chips.
And memory overclocking, which is way more important than core speeds, will depend on the RAM that winds up on your card. Our review sample came with Hynix RAM rated at 4ns (250MHz).
All of that said, when I showed fellow TR staffer Andy the test results for the Ti 4200 64MB, his first words were:
Wow, that thing overclocked like a mofo, didn't it?Why, yes. Yes, it did.
We got it 100% stable at GF4 Ti 4400 speeds (275MHz core/550MHz memory) and were able to run 3DMark multiple times. It performed like you'd expect: like a Ti 4400. Then we went up from there. The card wasn't 100% super-stable above Ti 4400 speeds, but it was stable enough at 300/580 that we could run some Q3A timedemos. All of this with only a stock cooler and no heatsinks on the memory chips.
I think those numbers speak for themselves. In fact, I'm pretty sure they're saying, "Hot damn." But maybe that's just me.
As always with overclocking, your mileage may vary, but if the production cards turn out to perform like this, well... wow. Ti 4600 performance out of a sub-$200 card would be very sweet.
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