Bumping this thread, and since this is my 1st message here I would like to start on a good note.
I've got the Cyclone version of the MSI 6850 OC, so I don't know if my experience totally applies to the other non-Cyclone/non-OC versions of that card, but I guess it can provide some insights. Needless to say that is my experience with my current rig, so that will vary on different builds.
Things I noticed:
1 - Use MSI Afterburner Beta
(latest is 2.2.0 beta 8) as it allows you to tweak the voltage. The version provided on MSI's website and CCC don't offer you this feature, and I found that it was necessary for a good OC. Saphire Trixx would lead to crashes on the first clock tweak, it doesn't seem to like this version of the card...so I'm passing it and sticking to AB beta.
2 - The core
clock can take some beating. I've found a that extremely stable setting at 950 on with 1150mV. Higher clock/voltages would cause errors/monitor to stop responding - very high values would lead to a GSOD.
3 - The memory
doesn't like lots of overclocking. Some reviewers managed to squeeze in a lit bit of overclocking, but none of the reviews I've seen so far provided results for long duration tests. The factory clock is already 100Mhz above the "lowest" version of the card (the XFX version), so I pushed for 1150 Mhz with 1275mV and it was 100% stable. IMO it's good enough.
4 - Bottomline
: this card already comes with a nice factory overclock. My "safe OC" @ 950 on the core is 90 Mhz above the factory setting and 175 Mhz over the XFX version of the card (775Mhz). IMO those are great values, despite the shortcomings on the memory OC. My top temperatures are around 64c on full-load with OC, which is 8c higher than the factory settings under those circunstances.
Most of all, great performance. Playing Crysis2 with solid 60 fps on extreme settings with some AA tweaks, DX11, HR textures @ 1440x900. Very happy camper here.
Cheers!Edited by diogo_cme - 10/19/11 at 8:04am