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5850 pcs+ core clock limit question

gazjones105

gazjones105

gazjones105

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is there any way to get this card past the 875mhz core limit without having to flash the bios?

i know the voltage on these cards are locked but is there any way i can get past the limit.

it only seems to do about 825/1125 anyway before it crashes. will this be because ive left the fan control on auto instead of increasing it myself?

what is the best software to use. i have tried to use CCC which put my card up to about 865 on the core but as soon as i play a game it crashes. CCC isnt very good.


thank you for any replays.


also, my case is very big and air flow is fine. it idels at about 40c on 760/1050 (stock) and psu is corsair 850w.
 
If it's not the reference board, it won't go any further. ATI Tray Tools might work but I need to check if it works with my xfx board.
 
I have the same card, they're just poor clockers (in relation to the voltage tweaked clocks people are getting).

mine will do 825/1150 daily overclock, suicide run I can get 875/1175 but it falls over after an hour.
 
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875Mhz actually seems like a very very good overclock on stock voltage, although, depends what stock is for that card. My Asus Cu 5850's stock voltage is actually 1.16v or so, while "stock" voltage on a 5850 was 1.087v on all reference cards. I'm not sure if you had unlocked limits all the way to 1500Mhz, you'd actually get very far beyond the 875Mhz you're at now.

Lets be honest, if you're willing to volt mod the card by soldering on resistors, flashing won't be the least bit problematic ;)

Basically I really don't think you'd get any appreciable increase, 875MHz is very good, my reference one needed 1.2v for around 925Mhz stable, and 1.3v for 1050Mhz.
 
If your card can't do over 825mhz on the core without crashing, then unlocking higher clocks won't help you at all.
 
I'm running my PowerColor PCS+ at 875/1200 on stock volts with automatic fan control and it's fine. Have you tried the Auto-Tune tool in Catalyst?

I haven't used MSI Afterburner yet as I found the UAC prompt at every startup annoying.
 
I think manufacturers removed the voltage tweak option for three reasons.

i). It saves them a few pence in manufacturing costs.
ii). More people will buy the more expensive 5870 because untweakable 5850's cannot outperform them.
iii). There will be less warranty failures due to overcooked GPU's.

Even the revision 2 ASUS and MSI cards with voltage tweaking cannot match the original reference boards for overclocks.
 
I got my 5850 PCS+ today. Got it because it was it was the only 5850 on my budget (on offer) and in stock.

OCed it to 875/1225 (max out the overdrive) and after 30 mins on BC2 only crashed once (10.5). I installed the 10.5a and no issue the rest 3 hours.

Now I cannot compare it with the 2x 5770 OC neither with the single 5770 I had (before I sell them).

The only difference is that now I have everything on high and runs very smooth without any lagging as it had happend few times with the 5770s.
 
wish mine would run at those clocks.

for some strange reason i get small black pixles showing on snowblind level on battlefield 2. even when its running stock clocks. only on this level though and no other game so it may be a drive issue.
 
Alsedo said:
I'm running my PowerColor PCS+ at 875/1200 on stock volts with automatic fan control and it's fine. Have you tried the Auto-Tune tool in Catalyst?

I haven't used MSI Afterburner yet as I found the UAC prompt at every startup annoying.
Click to expand...


ill give the auto tune thing a try again and see what happens.
 
I installed Catalyst 10.5 and kept having crashes while overclocking. Also had the issue with raised idle clocks. Went back to 10.4 and my system is stable with low idle clocks again. Needed to uninstall both in Control Panel and Device Manager for that to happen though.
 
I had issues with 10.5 and 10.5a, wiped them out and back to 10.4 without issues.

However I found out that I have to set the fan manually if I have to play BC2, because it doesn't raise the speed when the card becomes warm and crashes, when you have overclocked the card.

Ofc can be solved with two (on/off) shortcuts on the profile manager.
 
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