FSP 250 Modifications Possible?

[bigbeark]

This PSU caused me problems when I fitted a newer Epox NF6100 with FX-62 CPU into an Acer AM1640 case.

Took me a while to figure out that the FX-62 has TDP of 125 watts, and the maximum 3.3v+5v power of the FSP is 110 watts. So thats why it was rebooting all the time.

I opened up the PSU and all looks well. There are markings on the PCB that indicate it could be used for up to 400W PSUs. I note that every cap is Teapo. If the Primary Caps were 680 instead of 470 would that help?

Can someone look at the pics and tell me if it is possible to upgrade the performance of this PSU. It was made in 2008 and I bought the non-functional AM1640 it came in in 2011, so it's pretty new.

Thanks, Barry

[bigbeark]

Re: FSP 250 Modifications Possible?

I am going to take the 470uf 200W Teapo Primary caps from this PSU and use them in the SH250.

Can I then upgrade this one with 560uf or 680uf Primary Caps?

[momaka]

Re: FSP 250 Modifications Possible?

I think your motherboard powers that FX-62 from the 12V rail, not the 5V rail, so the 3.3V and 5V ratings should be irrelevant. Check your motherboard, though - if it has a 4-pin or 8-pin 12V power connector, it gives the CPU power from the 12V rail (looking at Google pics, seems like it does). The 12V rail on your PSU is rated for 180 W which gives you 15A at 12V. I would say that's cutting it a bit close. If the filtering on the 12V rail isn't good enough (i.e. bad caps or not enough caps/capacitance), I can see why the PSU is having problems.

680uF caps would be nice, but I don't think it would help the stability all that much.

With just the CPU and nothing else (i.e. no fancy video cards or multiple hard drives), a 250W power supply with a strong 12V rail should be enough to run the PC. I would suggest to go with a PSU rated for at least 18A on the 12V rail for such a setup.

[999999999]

Re: FSP 250 Modifications Possible?

Is that motherboard rated as capable of 125W TDP CPUs? A lot of mATX boards from that era weren't.