Can you get lower memclock with 6990's with a bios flash?

[jjshabadoo]

I read that you could with 6970's. I really can't find any info about lowering 6990 memclock. I got one for free as an RMA through xfx of a bad 5970 and want to use it, but it's pissing me off that I can't lower the memclock past 750 with gpu clock at 830.

Has anyone figured out how to to get lower memclocks out of these?

Thanks.