G73jh GPU OC

hi,
i need some help over here with over-clocking the 5870m.

i managed the get to 870Mhz on the core, stable perfectly, on maximum load the temp stabilized ate 83C, with fans on minimum speed , on 875Mhz i got a notification the ati driver has crashed, and recovered (without any BSOD, just small notification from catalyst center), i took it as a notification for "stop here with the OC", as a side note it happened after i opened a 1080P movie in parallel to furmark stress test, and then the driver crashed.

now, the weird thing is that i cant increase the memory clock even not with 5Mhz without getting random flashing black stripes on the screen, the black stripes coming even if furmark is not running.

im using msi afterburner as the OC software.

any ideas why i cant touch the memory clock?

Thanks!

 

Every card and chip is different, you could try editing the vbios with radeon bios editor.

 

The 5870 card in the G73JH is very prone to GSODs (the verticle grey lines). When released with origianl vBios it had terrible issues with memory timing causing GSOD for all when updated catalyst drivers were used, until the updated vBIOS improved things.

Even now if you run the latest Catalyst you find different combinations of core/memory may cause GSOD. Personally I find that overclocking the core produces a relevant increase in frame rates. The memory has a negligible effect, so I leave it stock. Tested on a couple of FPS benchmarks as well as Company of Heroes 2. Also the flicker when changing memory clock is a bit annoying (if you can having it adjust memory clocks dynamically, by editing in vBIOS or setting in Catalyst Control Centre overdrive).

If you are really keen to get the memory up as well, try increasing it with the core stock. Might be that when the core is that high, the memory triggers GSOD straight away, but with core at a lower value you can adjust memory. But I think you will find, as I did, that the core is the one that improves performance more. Originally I found 825 core, 1125 memory was stable, but as the catalyst drivers updated I had problems so reduced memory to stock. Might be able to find a happy balance between the two. Now just had overdrive set to 825 in Catalyst Control Centre.

Good luck, but don't spend too long on it as I reckon you won't notice much performance increase with upping the memory. Oh, I use AMD GPU tool to test, then when sorted set in catalyst control centre. For overdrive to be unlocked you need to flash the vBIOS from Chastity with overdrive unlocked.

 

thank for the explanation!
to be honest, i dont see any performance changes on 850Mhz. fps is the same, only the benchmark number is changing. i think ill just set the core to 800Mhz and will leave it like that.