[Kaippar]

I'm new to overclocking gpus and I oc'd my 4850 from 625/993Mhz to 700/1100Mhz(1,158volts) by flashing bios. Now i'm thinking is there still headroom without volt modding on hardware level.

What frequensies should I expect with current 1,158 volts?

 

[jigglylizard]

700 mhz is pretty good. Go up to 725 if you want to push it. I don't know if a 4850 can go much higher than that without high temps or artifacts. Test it thoroughly with looped 3dmark or crysis...

 

[rico2001]

^This.

You may have to turn down the memory clock down a little but you should be able to get to 720-730mhz core with the max stock voltage in the bios (1.15V).

 

[ZealotKi11er]

Cooling will help it a bit in terms of overclocking. Mine did 710Mhz/1175Mhz with stock cooler 1.158v and with a much better cooler i got it up to 750Mhz and that was ~ 45C under load. I did not stop there and did a pencil mod which was very very easy but need good temps and i got it to 860Mhz core with 1.35v but used it most of the times 800Mhz core with 1.3v.

 

[rico2001]

 

[jigglylizard]

Quote:

Originally Posted by ZealotKi11er Cooling will help it a bit in terms of overclocking. Mine did 710Mhz/1175Mhz with stock cooler 1.158v and with a much better cooler i got it up to 750Mhz and that was ~ 45C under load. I did not stop there and did a pencil mod which was very very easy but need good temps and i got it to 860Mhz core with 1.35v but used it most of the times 800Mhz core with 1.3v.

That's pretty impressive. Not sure if you can expect that, but good goal to aim for.

 

[Kaippar]

This weekend I'll try to push it to 750/1100Mhz. I'll post my results.

 

[smash_mouth01]

Quote:

Originally Posted by ZealotKi11er Cooling will help it a bit in terms of overclocking. Mine did 710Mhz/1175Mhz with stock cooler 1.158v and with a much better cooler i got it up to 750Mhz and that was ~ 45C under load. I did not stop there and did a pencil mod which was very very easy but need good temps and i got it to 860Mhz core with 1.35v but used it most of the times 800Mhz core with 1.3v.

Is this with your sig rig Graphics cards ?, if so not valid due to the OP is asking about 48590's not 4870's.

here's mine on stock air, and these are 4850's

and here's the other

 

[T3h_Ch33z_Muncha]

is that single or dual slot cooling?

 

[smash_mouth01]

Me ?, the ones I had gotten have the Glaciator heatsinks.
But yes they take the space of two cards so yes I think they are dual slot coolers, here's a pic of them.

 

[T3h_Ch33z_Muncha]

no i meant the OP...

 

[NZi]

Quote:

Originally Posted by smash_mouth01 Is this with your sig rig Graphics cards ?

Quote:

Originally Posted by ZealotKi11er Cooling will help it a bit in terms of overclocking. Mine did 710Mhz/1175Mhz with stock cooler 1.158v and with a much better cooler i got it up to 750Mhz

Meaning when he had a 4850, he could of upgraded.

 

[smash_mouth01]

yeah he could of , I'm just wondering what sort of cooling the ram had.
All I get at those speeds is tearing

 

[Kaippar]

Mine had the first one slot cooler whit that load temps were ~90c with stock clocks. Now it's cooled with Thermaltake DuOrb which keeps load temps much lower. I'll post exact numbers later when I get home.

 

[Kaippar]

Ok so load temps I got @700/1100Mhz were 55-60c, idle ~40. With stock volts&clocks orginal cooler couldn't keep load temps under 90c and now with more volts and about 10% overclock duorb manages to keep load temps under 60c

memory load temps get to 70c but if remember right those where higher with stock cooler too.

 

[D3FiN3 SiN]

Furmark

.

 

[Kaippar]

Furmark:

@1680x1050, noAA, 60sec

625/993Mhz - 39fps avg
700/1100Mhz - 44fps avg

@1680x1050res, 2xAA, 60sec

625/993Mhz - 31fps avg
700/1100Mhz- 36fps avg

 

[Kaippar]

Highest clocks I managed to get are 725/1150Mhz. Anything beyond that is unstable with current volts. I still have to test the stability with more testing but these clocks seem stable.