Anything around or above 80% is good, over 85% very good, over 90% rare and potentially great.My XFX 7850 does 1ghz core @ 1.075V (stock) & 1475mhz memory, ASIC is 83.6%, is that average? Power limit is at +4%.
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How to overclock a 7850 past 1050MHz?
- Thread starter 555BUK
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MSI card returned. A bit of good news is that my Powercolor card seems to have recovered from it's bout of sickness. I thought that I lost her for awhile, but after a good clean with Isopropyl all seems good again. I believe the sickness may have been caused buy some TIM from the Accelero cooler leaking onto the component around the GPU. Although this is meant to be non conductive, after giving it a good soaking with isopropyl and a clean with a fine brush she is back up and running again.
I think I'll be keeping her at 1200MHz 24/7 on the stock BIOS from now on. 1300MHz+ is nice, but I don't want to lose her for a second time.
I think I'll be keeping her at 1200MHz 24/7 on the stock BIOS from now on. 1300MHz+ is nice, but I don't want to lose her for a second time.
PCIE3 4x is the same as PCIE 8x. This is more than sufficient bandwidth for a 7850.
My MAXIMUN stable clock was 1125MHx on the core @ 1.225v with the MSI PE. By comparison my reference Powercolor card matched that at just 1.050v, and did 1260MHz @ 1.225v. With a BIOS flash to allow 1.3v and an aftermarket cooler the Powercolor does 1325MHz rock stable and could complete 3DMark11 and Heaven @ 1400MHz (far from stable).
The MSI PE cards are NO BETTER than any other card. To get a decent overclocker is pure luck of the draw because the main determining factor is the GPU, and none of the manufacturers cherry pick 7850's.
ASIC quality provides a reasonable pointer to how good the GPU is. I have owned 3x 7850's with the following ASIC's.
*VTX 7850 86.2% (Awesome overclocker)
*Powercolor 7850 84.9% (Awesome overclocker)
*MSI PE 7850 72% (utter pants)
What really irks me about the MSI PE card is that it cost me £30-£40 more than my other two cards and promissed much about overclocking on the box, yet fell MASSIVELY BELOW the performance of the cheaper cards. There is no point in spending extra money for the MSI card when there is zero guaratee of better overclocks.
edit: My MSI PE was DSR'd (returned) due to being so poor. I didn't buy it here, so be careful about about picking up any "b-grade" or "good as new" MSI PE's if you see them on offer elsewhere. If it was a reference card that performed so poorly I would have accepted it. However, this cards main selling point was it's superior overclocking ability, quote: "up to 45% overclocks" which were nowhere near reality. Will never buy an MSI "premium" card again.
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Did you flash the bios to get 1.25v? Mine was locked at 1.225v max, and I didn't want to flash it due to non-reference pcb.
BSOD's are usually CPU or RAM issues, especially at random intervals during the boot sequence.
I have benched 3x 7850's.
#1 ran happily @ 1260 / 1500 @ 1.225v
#2 ran happily @ 1325 / 1500 @ 1.3v
#3 could only manage 1125 / 1375 @ 1.225v
I got lucky with the first two, but unlucky with #3. Nothing is guaranteed, but most will do 1175 / 1450 with a minor bump in volts. Core speed is much more important than memory on these cards. It doesn't matter too much if the memory clocks poorly, but a poor core will hit ultimate performance.
I got up to 1400MHz on the core with mine
. It is benchable at that speed, but FAR from stable. 1325 is the max completely stable, but 1200 is plenty fast enough for 24/7. TTII is probably the best cooler for these cards.Few tips for you when you install the TTII.That was one of the reasons why I bought it
i). Use the black spacers.
ii). Don't bother installing the Mem or VRM sinks. They add absolutely nothing to overclocks and the supplied thermal adhesive is not that great.
An overclocked 7850 @ 1150MHz core offers similar performance to the GTX580. With both cards overclocked to the max, the GTX580 is faster, but not by much.
Not really. 7850's are GPU limited so overclocking the VRAM from 4800 to 6000MHz (25% OC) only boosts performance by 5-6%. A few hundred MHz in either direction will be largely unnoticeable within games. The GPU on the other hand provides almost linear gains.
1.225v is the BIOS limitation for the Sapphire cards. Sapphire also use a custom PCB so you probably cannot flash the BIOS to circumnavigate this limitation.
Not unless you are prepared to physically mod your cards voltage by soldering. 1100-1200 is the normal overclocking range for these cards, and to be honest there is very little real performance difference within that range.
ASIC quality is VERY IMPORTANT for these cards. I have now installed 4 7850's and ASIC quality directly impacts on overclockability. My original card has 84% and easily clocked past 1250MHz (1400MHz was even benchable @ 1.3v with third party air cooling). Two cards were in the mid 70's and could not reach 1200MHz, even with max volts and 100% fan. My latest card was 69% and sucked big time. It can just about do 1100MHz on max volts.
ASIC also affects default volts and temperatures.
>80% ASIC = 1.05v to 1.075v
72-79% ASIC = ~1.138V
<71% = ~1.21V
High ASIC's do not guarantee great overclocks, but they GRATLY improve the chances. Low ASIC's have the opposite affect.
ASIC also affects default volts and temperatures.
>80% ASIC = 1.05v to 1.075v
72-79% ASIC = ~1.138V
<71% = ~1.21V
High ASIC's do not guarantee great overclocks, but they GRATLY improve the chances. Low ASIC's have the opposite affect.
Make sure you have the PCI-E plug fully inserted (check both ends if PSU is modular). Also try a different output on the card.
It's a total lottery. The cheapest 7850 I have purchased (Powercolor refernce) had an 85% ASIC and overclocked lke a chanp, yet my most expensive 7850 (MSI TFIII) was an utter stinker. I have now owned 4 7850's and there is no way to seperate good from bad without first installing them.
ASIC quality is key when it comes to overclocks and cool running. My reference Powercolor card with 85% ASIC and 1.050v stock volts ran cooler than the TFIII card with it's superior heatsink but default voltage of 1.21v. Of course, a crappy ASIC may go further with good cooling but it is just polishing the turd.
For a similar price, the 7870 is the best buy. You would need to be really unlucky and get a stinker of a 7870 for it not to outperform a good 7850 (with both overclocked).