4850 overclocking problems

Monkeywoman · Oct 12, 2008

i have been trying to get some nice clocks for my 4850. i have swapped out the stock cooler for a thermaltake dual orb. lately i have been using Rivatuner to get my clocks of 721CORE and 1130MEM on stock voltages. i test my stability with COD4, i get no artifacts but when the battle heats up i get a BSOD; windows then tells me it's a driver problem.

are the clocks i'm choosing too high? do i have enough cooling? could it be something else that's causing instability?

Zubasa · Oct 12, 2008

I will say that 721 core might be too high for stock voltages.

PennySavre · Oct 12, 2008

A bit better than what I could do on stock cooling with a 4850... especially on the memory.

erocker · Oct 12, 2008

Most deffinitely not enough voltage for that GPU clock.

Monkeywoman · Oct 12, 2008

oh snap, is there a way do increase voltage without bios flashing? i'm a little worried about flashing and something goes wrong. what do you guys thing would be a good clock?

King Wookie · Oct 12, 2008

I'm pretty sure someone posted a pencil v-mod for the 4850.

I'll look for it.

Monkeywoman · Oct 12, 2008

i found the pencil mods, they are done by Wizz (http://www.techpowerup.com/articles/overclocking/voltmods/151/2)

they look easy and i don't think anything can go wrong. is there a special type of pencil i have to use? how do i keep what i pencil in from blowing away by my fans?

King Wookie · Oct 12, 2008

The recommendation is 2B or 4B.

The lead is not going to blow away, only erasing it will remove it.

You may find it useful to read through this forum:

http://forums.techpowerup.com/showthread.php?t=64217

I look forward to seeing your results.

erocker · Oct 12, 2008

Monkeywoman said:
i found the pencil mods, they are done by Wizz (http://www.techpowerup.com/articles/overclocking/voltmods/151/2)

they look easy and i don't think anything can go wrong. is there a special type of pencil i have to use? how do i keep what i pencil in from blowing away by my fans?

There are risks. Graphite from the pencil can get on to other parts and cause hardware failure. Just be very clean about it and take your time, make sure everything is done correctly. Use a can of compressed air aftarwards to be on the safe side.

Monkeywoman · Oct 13, 2008

hey, soo i coloured in the transistors with a mechanical pencil, .5mm. once i was done i blew off any dust that was on the back of the card. i pop the card into the comp and turn on it on....no video. the red leds on the back of the card flash once. the rest of the comp starts up normally, just no video.....what do i do now?

LifeOnMars · Oct 13, 2008

Rub it out ......quick

Monkeywoman · Oct 13, 2008

ok,so I removed the graphite with an eraser the cleaned it up with rubing alchohol. No luck. I put in my old card in and everything is fine. The card is fryed

NinkobEi · Oct 13, 2008

Monkeywoman said:
ok,so I removed the graphite with an eraser the cleaned it up with rubing alchohol. No luck. I put in my old card in and everything is fine. The card is fryed

this is the reason I've never tried a pencil mod...they can be risky if you dont know what you're doing!

Monkeywoman · Oct 13, 2008

Ninkobwi said:
this is the reason I've never tried a pencil mod...they can be risky if you dont know what you're doing!

i followed the instructions to the word. i think i must have put too much graphite and that caused it it fry. i didnt smell anything, prolly a short.

i'm going to start saving now so i can buy the fastest card i can so i wont have to do this again. 5870x2? aww man, i'm going to eat some turkey :cry:

King Wookie · Oct 14, 2008

Man! I'm sorry to hear that.

Of course, you should be able to rma the card, as you have erased any traces of your mod.

Hayder_Master · Oct 14, 2008

see my overclock way may you got something more stable
http://forums.techpowerup.com/showthread.php?p=1006593#post1006593

Widjaja · Oct 14, 2008

Man that sucks.
RMA. . . . .they will not know the difference.

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4850 overclocking problems

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