Mining scrypt with ATI radeon 5970 : undervolt - temperature question

[honorthebtc]

Hi,

I saw many volt/clock setup for this card, but with low memory clock for SHA-1 mining.

For scrypt mining, I noticed memory clock directly affect the hash rate.

So my question is : to lower this GPU temp and keep about the same hash rate, what voltage and clock do you use?
Note : i want the fan to run as low as possible since it makes a lot of noise!

Stock is : 725 core, 1000 memory, 1,05V.

thanks!