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How to overclock a 7850 past 1050MHz?

Is there any reason Afterburner hard locks my pc as soon as I apply an overclock on my VTX 7850?

The card clocks to limits quite happily in CCC, but Afterburner instantly locks my PC up HARD to the point only a hard reset will release it.
 
kitch9 said:
Is there any reason Afterburner hard locks my pc as soon as I apply an overclock on my VTX 7850?

The card clocks to limits quite happily in CCC, but Afterburner instantly locks my PC up HARD to the point only a hard reset will release it.
Click to expand...

yea ive found thts happening to me quite a lot...im finding it very diffucult to pinpoint my sweetspot...dont think i'll be able to hit 1200mhz even on max volt of 1.225,

I didnt install CCC cos i read here someone advised against it, and i had no real reason to....so CCC now can overclock to over 1050?
 
All you need is asus tweak tool 2.0.8.3, cats 12,3 official, or 12.4 betas and leave CCC installed. CCC only allows for an overclock on the core up to 1050 core and no further , tweak tool allows for clocks well above 1200 and clocks up to 1230 and over. Some of these cards will do that, others will not no matter how many volts you put through.
You can expect a clock of around 1150 core but some ppl have trouble running games at this speed without crashing even though it'll bench heaven without a problem. Apparently afterburner and trix haven't been optimised for these cards I reckon, hence the lockups, but I think they'll be done shortly personally.
 
Just want to Thank You to all of you.

I have just built my first rig for a good 10-15 years and was stuck and scratching my head choosing a GPU.

I now have a MSI 7850 in the post and will let you know how i get on

Once again Thank You :)
 
^ i see, well i managed to get a 1150 core at 1650mv (stock was 1138mv), no matter what volt i put in it jus wont go higher than 1150 n stay stable. Still pretty descent :D
 
I haven't read every post but have read enough to see that the vast majority do not seem to be benching their memory overclocks.


How are you guys setting those outrageously high 5.6-6GHz memory clocks? Have you performance checked those settings?


You do know the cards have error correction for the memory and the memory overclock won't crash the card (unless you go way, way over), just kill performance.


I have a 7870 that runs an easy 1200MHz core on stock volts (1.18xV, 79% ASIC). The memory can't keep up...


Benched Heaven:
@ 1200/5200(1300) ~ 53 fps 1330 score
@ 1200/5300(1325) ~ 59 fps 1440 score
@ 1200/5400(1350) ~ 53 fps 1330 score


I repeated several times with the same results. As you can see performance falls off big time over 5300. Notable is the cards performance increase from 100MHz memory overclock (from 5200 to 5300), huge, over 10% (fps), telling me the core is severely memory bandwidth restrained. Unfortuately my memory is all done at 5300 and I lose all gains over that so I won't see the full potentail of the core.


I'd really like to hear some real numbers for the memory performance, other than 'it didn't crash', because it won't (crash).


Perhaps my card just has lousy memory? But I would sure like to verify it. Help please!
 
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hmmm...timings change by themselves? Can anyone verify this?


Maybe I should raise the speed more to see if the performance starts to increase again? I don't know...these chips are only rated at 5GHz...
 
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They don't do it, the vidcard bios can be coded to do it. I'm not saying categorically that it does, but its an option to consider. Motherboard bioses do this when you lower ram speed, the timings tighten, so I see no reason stopping the vidcard doing this either. Maybe a more knowledgeable person can confirm or refute this 'cos i'm more than likely incorrect:):p
 
Well maybe your onto something here...I just ran another bench 1200/5500(1375) and it did recover, came back up to 59 fps 1480 score, about where it was at 1200/5300(1325).

I'll have to try raising it more later and see what happens.

Thanks pie,
 
pieman109 said:
If thats not a mistype, how did you get 1.58v? and if it is, is there a burning smell:p
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Hah yeah just a bit. 1.15V

Ive clocked it back a bit now since that post to 1150 / 5600. It was fine at those setting running the gpu-z render test but didnt work for long on 3d mark and afterburner.

I think maybe although it was stressing the GPU 100% it wasn't testing the memory much?
 
so my 1090@[email protected] ran unigine fine, but noticed it began not responding after the monitor went to sleep. actually i set it back to stock speed and it still didn't wake from sleep. i uninstalled the beta 12.4 and it still wouldn't wake. i finally uninstalled asus gpu tweak and that fixed the problem. this all under win 7 64 bit. when i hit the reboot button, it would boot once and then shut off, then reboot again. do you think the OC i mentioned from above was potentially hurting my GPU, or something else?
 
tuffluck said:
so my 1090@[email protected] ran unigine fine, but noticed it began not responding after the monitor went to sleep. actually i set it back to stock speed and it still didn't wake from sleep. i uninstalled the beta 12.4 and it still wouldn't wake. i finally uninstalled asus gpu tweak and that fixed the problem. this all under win 7 64 bit. when i hit the reboot button, it would boot once and then shut off, then reboot again. do you think the OC i mentioned from above was potentially hurting my GPU, or something else?
Click to expand...

Maybe with the low volts it didn't have enough grunt to get going again?
 
pandem0nium said:
Those gellid coolers sound like a bloody good idea. Only concerned about voiding the warranty tho. I mite wait till I can get free postage :)
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Well I suppose its a chance you take, but if you refit the cooler theres no indication thats been changed at all as far as I could see, and the benefits are a win all round. I put a fan voltage reducer adapter cable on the two fans to slow them down a bit and now they're totally inaudible and temps have risen....2c, so crysis 2 after an hour of playing only show 45c!
The performance for noise alone is great but you might even get a bit more clocking headroom out of the card due to keeping the vrms a bit cooler (thats pure speculation on my part I might add).
 
my previews setuop with 2 4870 in Crossfire mode (standard ATI Layout) has been doing his job for 4 years. And they are fine but i want a better card. This cards runs at 82-85C° so 72C° is good.

i think my spiders in the case now go out of it the temperature now with my 7850 with 45C° on load is to cold for the spiders now :)
 
Hey guys.
After reading this thread I bought MSI's 7850 TF3, installed it yesterday and went to 1200/5800 @ 1.195V with a score of 1435 in Unigine Heaven. Today, though, the GPU usage doesn't stay up for some reason when I'm benchmarking in Unigine. According to GPU Tweak it jumps from 0 up to 90+, then down to 0 and then up to 90+, which makes Unigine lag a lot and drop frames. Anyone got an idea of what it can be?

Looks like this
 
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