Piotke's Test Setup
CPU	AMD Athlon 64 3000+ @ 2.45 Ghz 1.75 Vcore
Mainboard	Shuttle AN50R
Cooling	Thermalright SLK948 U
Memory	2* 256 MB Corsair PC3500 @ 200 Mhz 2-2-2-5
Video	Sapphire Radeon 9800 XT
HDD	Seagate Cuda 5 7200.7 120 Gb Maxtor 40gb HDD
Optical	Nec 2500 A DVD R Sony CD-Writer

All tests were done with an ambient temperature of ~24° C and used a temp probe to measure the temperature on different parts outside and inside each PSU.

Silverstone EFN-300

When running the system idle the outside casing measured: 32°C
After stressing the PC for one hour the temperature on the same spot reached: 55°C
The Silverstone’s casing features some big venting holes and I poked the temp probe inside to find the internal heatsink at 68°C!

To prevent you from burning yourself the Silverstone features a small LED indicator at the back which will change color when the temperature of the unit passes “safe touching” levels.


Yesico FL-350

The Yesico unit dissipates generated heat through the large heatsink which sticks out at the back; installation of this power supply can be a challenge if your case requires you to slide the PSU from inside out.

Outside idle temperatures were 31°C
After stressing the system the housing measured 46°C
The heatsink at the back is only slightly warmer at 48°C

Overall not bad and thermal performance seems to be better with an external heatsink.