Let's start with my disclaimers:
Yes, I KNOW this voids my warranty.
Yes, I KNOW I'll need insane amounts of cooling.
Yes, I KNOW my CPU's memory controller needs to be uber-powerful to take advantage of this.

Now then...

I'm switching to 939 (probably Venice), since my 3400+ NC doesn't take RAM over DDR533. I posted an earlier thread asking for help, I killed a board trying, and I still haven't done it. Conclusion, my chip is limiting.

I've got a lot of BH-5, some of which does DDR550 with 3.5-3.6V or less (Micron-C as well, on less volts but slightly worse timings); I can't test any higher, since my I don't have a CPU with which to test it yet. I want to push it to DDR600+, but I don't think even 4.0V will be enough. I'm supercooling anyway (LN2 on the CPU, DI vapors on everything else- also known as CO2 that's just over freezing), so I want to raise my VDIMM even further.

1) I asked what would happen if I modded my PSU to run 6.0V on the +5V rail. I was cautioned against it, since the BIOS option for 4.0V would still feed 4.0V.
2) Is there a mod to feed the RAM directly off the +5V line, rather than through the jumper mechanism? I am prepared to undervolt if I need to, since my drives/video will be running off a separate PSU.
3) Would flashing a custom BIOS with over 4V options allow more, or is it not the BIOS that limits it? Is there an IC that I need to resolder/mod for this to work?

I'd appreciate any help, I will of course give credit where it's due for any help that pans out.

You might want to talk to tictac about possibly modifying your bios for the higher voltage. Not sure if it's possible, though.

CJ

Thanks for the advice- do you think he'd be willing to help me out, even presuming it's possible?

the board will limit the voltage to 4v as far as i know

have you thought about running on a divider? there's no real penalty using DDR180 and DDR166 divider and I have used both to really increase my clock speeds (cpu mhz is infinitely more important than memory bandwidth on the A64)

Come on, there's no glory in that!

Seriously, I'm not trying for raw clockspeeds. I'm trying to stress each component of my computer separately, hence the supercooling. First will be pushing the CPU, then the RAM, then perhaps the HTT. I'm trying to score a record somewhere, just so my school feels that they're getting their money's worth; I'm getting some sponsorship from my college since I'm their best computer guy- and I'm not even a computer science major! :shake:

Ultimately, I'm shooting for a 3500+ that takes DDR600 and runs 300*11=3.3GHz (remember, Liquid Nitrogen with DI on the MOSFETs and RAM; otherwise I would/will settle for a 10x multi). If I'm lucky, I'll even get a 3800+ that runs a 12x multi for a grand total of 3.6GHz, but that would just be an added bonus and an early birthday/going-away present.

TicTac was kind enough to point me here. BIOS modding isn't an option, apparently.

AG, do you think you could find out whether or not it's possible to mod the first stage of the VR circuitry to run over 4.1V? If I can bring this up to about 4.6V, the second stage will run 4.4-4.5V and I should be able to hit my goal.

Considering the nature of my project, you can imagine that stability isn't my top priority. I've got enough RAM lying around that I can fry a stick or two and not feel TOO bad about it.