so guys....i'll sell my AGP-6800Ultra and want to settle on a SLI-system....but i won't buy 2x 6800Ultra's but 2x 6800GT's

so, i'll cool both cards with water....and mod the BIOS' to 1.5V VGPU

but i only know, what's the average-oc'ing of ultras....could you all guys who has a 6800GT tell me, how far you can go 100% stable (not benchstable - i mean, when you can play f.e. FarCry forever ) on water (air-results are OK, too)

i just want to estimate, how far i'll probably go