I have a similar problem. For answer : The "easy way" is to active the DOCP profile (timing from the dimms).
I try to change my single dimm setup to a dual channel (2x16 go Corsair Vengance PRO - 3200). But I can't active the DOCP profile. The PC doesn't boot. I try to set the timing manually, but, the "custom" bios of the G35 can't tune the DRAM voltage (no option for that).
So, I'm thinking to change the motherboard for a another brand... (if any one has a advice for me).
For information :
I try another set of RAM..
Trident Z Neo 3600C16 (16-19-19-39) : No boot with DOCP... Boot on set at 3600 with horrible timing (25+)
Very sad for the cheap motherbord.. 😞
The G35DX motherboard is still crippled in April 2023 with latest (315) bios. This is pretty bad form from ASUS for a purportedly high-performance machine and someone should take ownership of fixing it. These are expensive machines and when you lose customers like me, you lose us for good.