overclocking a Ti4200?

[Arbzask]

i have a GF4 Ti4200, its not been designed specifically for overclocking, as there is only the chip cooler, no ram coolers, however i do have an extraction in the bay directly under it, which quickly whips out all hot air. i am really wondering how far i can o/c this thing with no extra cooling. basically, i was trying to push up the ram speed, and i read somewhere, to find the optimum ram speed you do the following

1000 / 4 * 2

where 4 is because my memory on the card has an access time of 4ns and *2 because of ddr.

this gives me the answer of 500Mhz, quite a lot faster than it is currently set.

the big Q:

can i do it with no extra cooling?


cheers
Arbz.

edit: oh also, how far could i push the chip... its an AOpen GF4200 Ti with 128Mb ram

[Spyda]

basic rule, +10% = safe OC limit

[Surge1243]

Start by increasing the core and memory clock speeds by a couple of MHz and then check to see if you get any graphic glitches or lockups. If you don't, go a little further. If you do start to get some glitches bump the speeds down a bit and keep them there. Also monitor the temps to make sure they are still at an acceptable level.

[Arbzask]

thanks for the replies!

is there anyway i can monitor the temps of the gfx card? im not sure if they have a probe onboard :S

cheers
arbz

[glc]

The video will get flaky before it's hot enough to cause problems.