I got a old Slot A heatsink cut up on the GF2 in this comp, if you find one that had the fins in the middle with the fan on, then a gap each side and then another set of fins (4 deep), you can cut each end section into 2 and mount them accross Ram chips mounted horizontally (end to end, not side to side) and use the chunk in the middle with the fan on the CPGu itself.
on my GF4Ti4200 i have an Asetek Waterchill GPU block and some slightly modified Thermaltake heatsinks (the ones that come with Ram heatspreaders), on my GF4MX440 i have a modified stock cooler for a 1800XP and a cut up section of aluminium heatspreader for a 24-12VDC inverter on the Ram, on my GFFX5200 i have a old northbridge heatsink (quite a big one, about 2" tall) with a 40mm fan hot glued to each side and a peice of cardboard over the top so it acts like a tunnel, and some Coolermaster aluminium ramsinks, and on my GFFX5950Ultra, i have 16 TweakMonster BGA Ramsinks, a blue Danger Den Maze4-GPU block with 1/2" brass fittings, the core has the heatspreader removed and there are 2 240V fans from my heatercore pushing about 250CFM of cold air over it.
i'm well cooled in the GFX division