VX550W E8500 3.8 OC + CF HD4850

[TechDwarf]

Hello everyone.
I have a question:

Can I run a E8500 @3.8 + two HD4850 512MB in Crossfire with a Corsair VX550W. I currently run the CF configuration, with 0 problems. Before I had the E8500 OC'ed to 3.8, no problem. But if I do the 2 things at the some time, is it too much for this PSU?
I have 4GB Kingston HyperX DDR2 800Mhz, 1 HDD, 1 DVD drive, 1 card reader. The case has 4 120mm fans. The mobo is a Asus P5Q Pro. Could I run the OC with the CF without risking burning the PSU? Is it better to get a new PSU?

Thanks in advance.

 

[jsc]

Yes. Two 4850's - 15 - 18 amps. OC'd E8500 - 8 amps. That's about 280 - 300 watts. RAM and drives - another 100 watts. Fans - pocket change.

I estimate that the PSU would be running 75 - 80% of rated capacity. That is a little higher than I am comfortable with, but the VX550 is a pretty good power supply.

One of my systems has an OC'd Q9550, 4 GB RAM, a GTX260, a Gigabyte EP45-UD3P motherboard, 3 hard drives and an optical, and a Soundblaster card all powered by a Corsair 750TX.

Running 3 instances of Prime95 to load the CPU and 3DMark06 to load the GPU, it pulls 375 watts from the wall as measured by my Kill-a-Watt meter. Figuring 80% efficiency, the system pulls 300 watts from the PSU.

 

[TechDwarf]

Yes. Two 4850's - 15 - 18 amps. OC'd E8500 - 8 amps. That's about 280 - 300 watts. RAM and drives - another 100 watts. Fans - pocket change.

I estimate that the PSU would be running 75 - 80% of rated capacity. That is a little higher than I am comfortable with, but the VX550 is a pretty good power supply.

One of my systems has an OC'd Q9550, 4 GB RAM, a GTX260, a Gigabyte EP45-UD3P motherboard, 3 hard drives and an optical, and a Soundblaster card all powered by a Corsair 750TX.

Running 3 instances of Prime95 to load the CPU and 3DMark06 to load the GPU, it pulls 375 watts from the wall as measured by my Kill-a-Watt meter. Figuring 80% efficiency, the system pulls 300 watts from the PSU.

So, I could do it without getting a new PSU. Great.

Anyway, I wasn't thinking in a permanent OC. I would save the O.C. profile on my Bios and load it when needed. I don't need that much power all the time.

Before having too HD4850, I ran the OC for 3 or 4 months (always overclocked), during winter, and I had nice temperatures and the system was stable. I just changed the FSB too 400 and everything on Auto and never had any trouble. I even ran Prime95 for 24 hours.

Well, maybe I'll use it when I need more power.

Thanks for your answer.

 

[jsc]

You do not need two profiles. Just leave SpeedStep enabled. Under light loads, the BIOS will drop the internal multiplier back to 6.

 

[TechDwarf]

You do not need two profiles. Just leave SpeedStep enabled. Under light loads, the BIOS will drop the internal multiplier back to 6.

OK, great. So, if I change change the FSB to 400 and leave everything else at Auto settings, I will be OK, right?
Thanks.