PDA

View Full Version : Does the GeForce4 PCB size affect overclocking?


butter
03-15-03, 04:16 PM
im planning to get a pny ti4200 but from the pictures it is smaller than a ti4600. i remember reading a long time ago that smaller ones cant overclock. is any of this true? plz shed some light on this topic.

Smokey
03-15-03, 08:26 PM
If its a little 4200, it will still overclock. As for the memory, that depends on which memory it is also, some cards use faster memory than others. I do believe thought, that the 4200s that use the same pcb as the 4600, should overclock more, but im not 100%. Ive been playing around with my brother inlaws 4200, its a small one defaults are something like 250/440 there abouts, and so far i have it at 290/530, get major artifacts running the memory any higher. I still have to do some more testing, we are using Unreal2, Never Winter Nights and MOH for testing, using the 42.86 drivers.

Lezmaka
03-15-03, 08:56 PM
Originally posted by Smokey
If its a little 4200, it will still overclock. As for the memory, that depends on which memory it is also, some cards use faster memory than others. I do believe thought, that the 4200s that use the same pcb as the 4600, should overclock more, but im not 100%. Ive been playing around with my brother inlaws 4200, its a small one defaults are something like 250/440 there abouts, and so far i have it at 290/530, get major artifacts running the memory any higher. I still have to do some more testing, we are using Unreal2, Never Winter Nights and MOH for testing, using the 42.86 drivers.

I'm pretty sure the 4400/4600 boards have a couple more layers than the small 4200 boards. That should help keep the signals cleaner (I think, lol) which could allow for higher frequencies.

MuFu
03-16-03, 10:53 AM
Originally posted by Lezmaka
I'm pretty sure the 4400/4600 boards have a couple more layers than the small 4200 boards. That should help keep the signals cleaner (I think, lol) which could allow for higher frequencies.

Yes, they also have active termination (reduces signal reflection on the memory TLs). The extra layers (8 vs. 6) improve trace separation, reducing inductive/capacitive coupling and dialectric leakage (although that isn't too much of an issue as speeds <1GHz). Extra PCB space is also needed for the slightly bulkier power regulation stages found on the Ti4400/4600 boards.

So yeah - the larger boards overclock better. :D

MuFu.