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ATI 3850/70 Maximum Overclock

RaiderX

RaiderX

RaiderX

Soldato
Joined
18 Feb 2007
Posts
3,155
Location
Wirral
Hi, as i have just got my 3870 i have clocked it as much as i could running 3dmark each time i changed the clock. the maximum i could get to bench was 890MHz on the core and 2800MHz on the memory, this is with the stock cooler and fan on 100%, no volt mods were applied to the card and i got load temps of 41c. i am posting this to see what clocks other people have got on there cards, please state cooling used, any volt mods, core clock, memory clock, and 3dmark score including individual SM2/3 scores. i will add a table when enough scores come in.

Example:

Card: Sapphire 3870 512MB
Cooling: Stock
Maximum Core: 890MHz
Maximum Memory: 2800MHz
3DMark06 Score: 13059
SM2: 5117
SM3: 5541
CPU/Clock: Core 2 Quad Q6600 @ 3.2GHz
O/S: Windows Vista Ultimate

http://service.futuremark.com/compare?3dm06=4649340

This is for both 3870s and 3850s so we can also get a comparison between the 2. table will be ordered by core clock, then memory
 
Last edited:
Card: Sapphire/Powercolor 3870 512MB x2 Crossfire
Cooling: Stock on gpu's
Maximum Core: 850MHz
Maximum Memory: 2452MHz
3DMark Score 20341 3DMarks
SM 2.0 Score 8295 Marks
SM 3.0 Score 9178 Marks
CPU Score 5858 Marks
CPU/Clock: Core 2 Quad Q6600 @ 4GHz
O/S: Windows XP

http://service.futuremark.com/compare?3dm06=4538095

this is usless for me as id didnt bench the gpu's much tbh and didnt go for max clocks i was doing cpu clocking at the time and have since sold the cards
 
Last edited:
gt_junkie said:
This always makes me smile! :D

I only got mine to 770/999 on stock volts and stock single slot cooling.

gt
Click to expand...

That's about the average and not a bad clock at all. These cards seem to require a good bit of voltage to get above 850mhz or so. Running 1.45 for my 850mhz...requires 1.55 for 960mhz and 1.65 for 1012mhz. I only went that high to see what she could do :D
 
mine was 1.27 idle 1.33 load. I think the 3870 is higher

I'm using the HIS IceQ3 bios though, not sure if that has slightly higher voltage than the stock Powercolor 3850
 
:eek:You sure your mem is running at 2800mhz ? that kinda overclock to me looks impossible unless using dry ice or something else exotic.


RaiderX said:
Hi, as i have just got my 3870 i have clocked it as much as i could running 3dmark each time i changed the clock. the maximum i could get to bench was 890MHz on the core and 2800MHz on the memory, this is with the stock cooler and fan on 100%, no volt mods were applied to the card and i got load temps of 41c. i am posting this to see what clocks other people have got on there cards, please state cooling used, any volt mods, core clock, memory clock, and 3dmark score including individual SM2/3 scores. i will add a table when enough scores come in.

Example:

Card: Sapphire 3870 512MB
Cooling: Stock
Maximum Core: 890MHz
Maximum Memory: 2800MHz
3DMark06 Score: 13059
SM2: 5117
SM3: 5541
CPU/Clock: Core 2 Quad Q6600 @ 3.2GHz
O/S: Windows Vista Ultimate

http://service.futuremark.com/compare?3dm06=4649340

This is for both 3870s and 3850s so we can also get a comparison between the 2. table will be ordered by core clock, then memory
Click to expand...
 
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