What are you Overclocking your 4850 to?

D

DWade

Limp Gawd
Joined
Dec 22, 2008
Messages
247
Prettty sure a lot of people own this card. Want to know what other people have this card clocked at...both gpu and memory, and if you think there is a performance improvement that makes it worth ocing.
 
Factory OCed @ 750 MHz core and 1800 MHz memory :p j/k

Actually I'm really interested to see the numbers since the HD 4850 is just a downclocked HD 4870. The clock on the core should be able to reach 750MHz right?
 
alg7_munif said:
Factory OCed @ 750 MHz core and 1800 MHz memory :p j/k

Actually I'm really interested to see the numbers since the HD 4850 is just a downclocked HD 4870. The clock on the core should be able to reach 750MHz right?
Click to expand...

Yep, from what I can tell it is. The only difference is that the reference 4870 cooling is way better than the reference 4850 cooling. And the 4850 is set to run at 1.15v vs the 4870 to run at 1.26v under load.

But, if you have better cooling.. like on the ASUS top 4850, you should be able to reach 750 quite easily. And even that cooling I consider quite inadequate. Once I get mine and have it for a while, it is going to get a much better air cooler.... like a thin finned 4 heatpipe AMD Opteron or Athlon 64 X2 OEM cooler - the higher profile one. Should bring the load temps on the card down quite a bit. That is of course with a custom duct and different fan(s). And it will also get RAM sinks.

And you have to live with GDDR3 instead of GDDR5. But for the price, the 4850 can't be beat.
 
I cannot overclock the memory on my 1GB Sapphire 4850 at ALL. If I turn it up even 20MHz over 993MHz, I get a BSOD. I also get BSOD's above 685MHz core. I am running Vista64 + dual monitors.. any tips? :p
 
Also, if any of you have a reference-based 4850 1GB board and are able to overclock better than I, would you mind dumping your BIOS so I can give it a try?
 
The reference cooler is super sucky. You are not going to get much of an overclock at all on it.
 
alg7_munif said:
Factory OCed @ 750 MHz core and 1800 MHz memory :p j/k

Actually I'm really interested to see the numbers since the HD 4850 is just a downclocked HD 4870. The clock on the core should be able to reach 750MHz right?
Click to expand...

I don't see how it's just a downclocked 4870. I mean the 4850 does have gddr3 as opposed to the
gddr5 on the 4870. Oh yah And I have the sapphire model with the flower-like cooler on
it, not the single slot desgn. Also the 4850 I got has Qimonda Ram as opposed to the
Hynix Ram. Not sure if that makes a difference in the ability to overclock the ram.
 
alg7, Catalyst only let's you OC to 700mhz core / 2400mhz mem, so 750 isn't possible
on Overdrive at least.
 
Rizen said:
I cannot overclock the memory on my 1GB Sapphire 4850 at ALL. If I turn it up even 20MHz over 993MHz, I get a BSOD. I also get BSOD's above 685MHz core. I am running Vista64 + dual monitors.. any tips? :p
Click to expand...

i also have 1 reference sapphire and its also good to about 685 but the ram is at the best 1005.

 
The Asus TOP 4850 is factory clocked at 680 / 2100. I might try that. Anyone got the bios
for that card? :D
 
I hope you guys have better luck then I did with my old one.
I had a gfx chilla cooler on it temps in the 30's idle and 50's load and I could not get 50mhz on the core
 
I can't really overclock my 4850 512MB much at all. I just had OverDrive try to OC it and it never got very far only to about 700MHz before the card failed, so I just turned it off. I have the MSI card with the newer Zalman like cooler but it didn't seem to make any difference. But the OC doesn't really matter that much to me, the 4850 is still a great improvement over my X1900GT.
 
I'm at 700/1000 when running 3D applications. Downclocked to 500/750 for regular 2D use.
 
I can run at 700 / 2046 just fine. Tested the clocks on Crysis Warhead which usually
utilized 90% and up of the GPU.
 
7-11, boyee.

Dealio VisionTek card from BBY - stock cooling, for now.
 
750/1100 with stock cooler (yes, the single slot sucker).

Fan speed tuned to 45% ~ 60% depending on temp.
 
I finally stuck my old HR-03 Plus on there and NOW it overclocks. I'm @ 700/1100 right now.
 
Powercolor HD4850 here, stock bios, stock cooling, purchased only a few weeks after the 4850 was introduced.. 3D clocks are set for 700/1100 in CCC. Auto-tune will actually set my mem clocks higher, but I can see artifacts with anything much over 1100. I have a hunch that with better cooling I might be able to get the core up a bit more (725?) but it doesn't really seem worth it.
 
Yeah, I tried to push my core up, but 720 caused a freeze. I saw artifacts @ 1150 on the ram too. So it looks like 700/1100's where I'm gonna live. :D
 
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