The 65 is way more stable, but I've found that it does NOT like the extra pcie on the mobo plugged in and set a pci latency of 64. Plus i never had to short any pins on them.

Fyi. my buyer of my 11 machines just fell through so if anyone wants any 6 card 5830 riggs I'm in SoCal. 7x GD64's, 4x GD70's

I'll let em go for $1050