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How to overclock a 7850 past 1050MHz?

I'm going up to 95c in UNI with 1.175v @ 1200mhz core/5600mhz ram - Why are my temps so damn high :S. My idle temps are 58/60. I have two cards in crossfire but surely that doesnt explain such high temps :S.
 
Well I got my 7850 to 1275/6000 with 1.2 voltage, Max temps while playing bf3 were 54 degrees, fan speed never exceeded 40% after 45 minutes.

I did cheat however, more on that later.

For now heres the gpu tweak after running 3dmark, and the 3dmark score.

http://bugsy.pwp.blueyonder.co.uk/ati7850.jpg

I will overclock more after I get my vipers tomorrow, 3 of them and sort out my h80 so I can boost the Bulldozer up. If anyone wants to help find the max of this chip im happy to share screen on skype ect.
 
Ok boys and girls, my Gelid cooler turned up today, so that got slapped on and a bit of testing got done. Now I'll say from the off that my 7850 ain't a good clocker, I was lucky if I could bench heaven at 1150 core with 1190volts, and crysis 2 kept crashing at anything over 1125 core, with the same volts, temps in both heaven and crysis would max out at about 72c-75c and thats with the fan at around 60%-70%
Now with the Gelid cooler, I can run crysis 2 at 1160 core, 1180 volts and temps NEVER go over 42c! Heaven can bench at 1185 core at 1.2 volts, and still the temp never goes above 40c
When I tested Heaven at stock, I saw 37c load.
I haven't sorted out the fan speed atm so its running at 100% with no speed control available, but more of that later. Heres some pics:
p1050475custom.jpg

By rainstel109 at 2012-04-18
They do like their thermal paste, whoever put this much on must be costing VTX a fortune!
p1050476custom.jpg

By rainstel109 at 2012-04-18
Same goes for the heatsink base, they absolutely smothered it on.
p1050482custom.jpg

By rainstel109 at 2012-04-18
Heres the actual cooler mounted, all the ram chips and VR modules have heatsinks applied to them using the thermal tape which, btw, was doddle to use and very effective. I couldn't use tall sinks on the vrms as they fouled the bottom of the cooler when it was mounted.
p1050485custom.jpg

By rainstel109 at 2012-04-18
Heres the card installed in an Antec 300 case. when the cooler is mounted, it makes the whole vid card assembly about 3" longer but luckily the card is short anyway. Longer vidcards I reckon might pose a prob if used in a case like this and the gelid is used.

Now about the fan. Both fans run at max speed all the time, about 2200rpm, and thats plugged into the vidcard via a 4 pin plug, but only 3 connections are used so this means that PWM control of the fan speed is not possible. Although the fan is deffo audible, its not too intrusive and more of a "low "wooshing" noise than the whine you get from the VTX cooler fan.

But, in the box that the cooler came in, theres fan connection lead that has an identical plug on one end, but with 4 connections used, a molex connector in parallel and a female fan socket mounted one of the other ends. This, I believe could be a conversion cable for the fan to give the user auto speed control, though saying that, it could enable use form a baybus fan control panel. but if thats the case, why have all 4 connections occupied?
I'll be looking into this in the next couple days

So, is it worth it? For me I'd say yes, its enabled me to drop me voltage a tad, raise the core speed a tad too, and keep the temps down to a ridiculously low value. This is for gaming, not benching as in Heaven I can go a bit higher still before crashing.
Any questions, feel post here and I'll do me best to answer them.
 
pieman109 said:
Ok boys and girls, my Gelid cooler turned up today, so that got slapped on and a bit of testing got done. Now I'll say from the off that my 7850 ain't a good clocker, I was lucky if I could bench heaven at 1150 core with 1190volts, and crysis 2 kept crashing at anything over 1125 core, with the same volts, temps in both heaven and crysis would max out at about 72c-75c and thats with the fan at around 60%-70%
Now with the Gelid cooler, I can run crysis 2 at 1160 core, 1180 volts and temps NEVER go over 42c! Heaven can bench at 1185 core at 1.2 volts, and still the temp never goes above 40c
When I tested Heaven at stock, I saw 37c load.
I haven't sorted out the fan speed atm so its running at 100% with no speed control available, but more of that later. Heres some pics:
By rainstel109 at 2012-04-18
They do like their thermal paste, whoever put this much on must be costing VTX a fortune!
By rainstel109 at 2012-04-18
Same goes for the heatsink base, they absolutely smothered it on.
By rainstel109 at 2012-04-18
Heres the actual cooler mounted, all the ram chips and VR modules have heatsinks applied to them using the thermal tape which, btw, was doddle to use and very effective. I couldn't use tall sinks on the vrms as they fouled the bottom of the cooler when it was mounted.
By rainstel109 at 2012-04-18
Heres the card installed in an Antec 300 case. when the cooler is mounted, it makes the whole vid card assembly about 3" longer but luckily the card is short anyway. Longer vidcards I reckon might pose a prob if used in a case like this and the gelid is used.

Now about the fan. Both fans run at max speed all the time, about 2200rpm, and thats plugged into the vidcard via a 4 pin plug, but only 3 connections are used so this means that PWM control of the fan speed is not possible. Although the fan is deffo audible, its not too intrusive and more of a "low "wooshing" noise than the whine you get from the VTX cooler fan.

But, in the box that the cooler came in, theres fan connection lead that has an identical plug on one end, but with 4 connections used, a molex connector in parallel and a female fan socket mounted one of the other ends. This, I believe could be a conversion cable for the fan to give the user auto speed control, though saying that, it could enable use form a baybus fan control panel. but if thats the case, why have all 4 connections occupied?
I'll be looking into this in the next couple days

So, is it worth it? For me I'd say yes, its enabled me to drop me voltage a tad, raise the core speed a tad too, and keep the temps down to a ridiculously low value. This is for gaming, not benching as in Heaven I can go a bit higher still before crashing.
Any questions, feel post here and I'll do me best to answer them.
Click to expand...

I couldn't afford one of these so machined the stock amd 8150 cooler, similar results though :)

http://bugsy.pwp.blueyonder.co.uk/ati78503.jpg
 
Jarrod said:
I'm going up to 95c in UNI with 1.175v @ 1200mhz core/5600mhz ram - Why are my temps so damn high :S. My idle temps are 58/60. I have two cards in crossfire but surely that doesnt explain such high temps :S.
Click to expand...

please say the temps on laod and idle with only one card and this settings you make with 1200/5600
 
The VTX whine is what I was worried about.

I'll be ordering a Sapphire once the new PSU arrives -- current generic one is running at 13.78V on the 12V rail :S
 
After rebooting 574 million times in the last 3 days, im done with gpu tweak and its shenanigans, ill be using 1050/5800 in CCC while waiting for proper software that works.


i hope they do an update of afterburner or sapphire trixx soon.
 
Final Resultat for me on a sapphire 7850 OC is :

1280 GPU clock anything higher got a ctd

6000 MEM didnt want to go higher

1.215v Stable on Heaven 1920@max Settings Loop

Graphic Score 7200 on 3dmark11 Performance Benchmark

Overall P6500 because CPU [email protected] bottleneck the gpu

I think i can go 1300/6000 in Games with max voltage But this is Not Stable on benchmark
 
Last edited:
HeX said:
72C is perfectly fine, good OC :) Could prolly drop the fan speed down to 50% and still be under 80C.
Click to expand...

I have my doubts about that Hex mate, it appears that "chuchulain" has roughly the same limitations as me. Mine would just bench at those settings, but any hgher and it bombed out every time irrespective of volts applied. Also, my temps were about the same. However, since I installed the gelid cooler and put a fan speed reducing adapter on it, the things barely audible, temps are now maxing at 44c with settings of 1175/ 5800/1.185volts when benching, and when playing crysis 2 at 1160/5800/1.185volts, temps never go above 55c. I have a sneaky feeling that with heatsinks on the VRms, and very low temps on these modules, they're able to better maintain a higher stable voltage setting so enabling a slightly higher overclock. When gaming, I found at those speeds and slightly lower, the system would crash with temps around 60c. As said, I reckon its keeping the vrms a bit cooler thats making the difference, well for me at any rate. :)

Edit: Hex have a look at post no: 625, theres a few pics of the gelid and have a look at the amount of paste that was applied.
 
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Those Geild's are superb coolers. By the look of that stock VTX cooler it seems to be the same one they used back on the 5770's (egg cooler), they've just put a full shroud over it. Cheeky.

scaledphpserver260filen.jpg
 
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