Overclocking / voltmod problems on HD4850 (SAPPHIRE DUAL SLOT)

[Danjos]

Ok, so this is the newer sapphire 4850, with improved cooling, and it comes on a smaller pcb.
The problems i have are that i cant seem to overclock the card using the BIOS mods with RBE and winflash, ie, i edit the bios, flash it, check with gpu-z/CCC and it either makes no visible difference or the clocks appear to have changed but the card does not run any faster, i get standard scores in benchmarks, so its as if the card is ignoring the new clocks.

Secondly, i have found info on how to voltmod the original 4850 on the older pcb, but not for the new/improved 4850 pcb. The pictures of where to apply the pencil-mod are clearly for a different pcb and do not match my sapphire 4850.

If anyone can help me with overclocking this card i will be most grateful

as it is now i can get 685/1100 using ati overdrive, but im reading of people hitting 850-900 core speeds and i feel inadequate and slow ! hehe

gonna have to sell it if i cant overclock it properly.

cheers

 

[sarge78]

Sapphire's own 4850 is designed to reduce costs rather than improve performance (It should be the cheapest on the market). So I wouldn't expect it be a great clocker (although some reviews have got 725+ on the core)
You could try reducing the mem o/c (very little performance gain) and see if that allows you to get 700 on the core?

Tbh that's a good enough clock... the higher you go the less gains you get.
Going from 675MHz to 800MHz only netted me a few fps in most games.

Oh and 850+ is the domain of water cooling/extreme air cooling only
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