BFG Tech 650W Power Supply

PROD LINK: Not Available
PRICE: $114.99 @ NewEgg
Price is at the time of testing!

What do you get with the BFG that you don’t get with the ePower? Well, BFG gives you a lifetime warranty with 24/7 tech support. ePower has a three-year warranty, a support email, and a voice mailbox.

BFG Tech 650W

The cables are “very Topower” with the snake-skinned PCI-e cables with the ferrite cores and filter capacitors, and the sleeved main ATX cable and 2×2/2×4. As usual, I wish the other cables were sleeved as well. Red, yellow and black is so hard to match in a custom color scheme.

BFG Tech 650W – Cabling
Type of Cable
Fixed Cables
ATX connector 20+4
2 x 2 12V connectors 1
2 x 3 PCI-e 2
8-pin Xeon/EPS connector 1
6-pin Xeon/AUX connector 0
5.25″ Drive connectors 6
3.5″ Drive connectors 2
SATA Drive power connectors 4
Fan only connectors (thermostatically controlled 12V only) 0

BFG Tech 650W

Our cable count is pretty good here. We have two PCI-e’s, four SATA’s, six Molexes and two floppy connectors. That’s perfect in my book. If you can’t have too many, this is certainly the least I’d like to see.

BFG Tech 650W

The BFG label doesn’t tell us very much (sorry about the blurry photo.) There’s no 3.3V, 5V combined wattage rating. No 12V combined rating. Furthermore, the specifications on the label don’t match the specifications on the box! On the label, we see 0.5A for the -5V and 0.8A for the -12V. On the box, these rails are rated at 1A each!

But thanks to ePower, we have all of the specs we need.

BFG Tech 650W – DC Output
DC Output +3.3V +5V +12V1 +12V2 -12V -5V +5VSB
30A 54A 20A 20A 0.8A 0.5A 2.5A
Max Power 270W 456W 9.6W 2.5W 12.5W

456W translates into 38A on the combined 12V rails. Not too shabby at all. We’re going to take that number and divide by two and make that the max load for each 12V rail during test 5. As usual, the “low load” is going to consist of a 2A load on the 3.3V rail, 5A load on the 5V rail and 3A on each of the 12V rails.

As usual, throughout all tests, the -12V rail is loaded with 0.5A and the +5VSB is loaded with 2A.

BFG Tech 650W – Cold Load Tests
Test # +3.3V +5V +12V1 +12V2 DC W/
Eff. P.F. In./
Progressive Load Tests
1 2A 5A 3A 3A 119.3W 77% .66 24°C/
3.38V 5.05V 11.93V 11.93V
2 5A 10A 7A 7A 248.3W 79% .73 24°C/
3.33V 4.99V 11.86V 11.85V
3 7A 14A 11A 11A 366.8W 77% .76 24°C/
3.28V 4.96V 11.76V 11.75V
4 10A 17A 15A 15A 480.9W 74% .77 24°C/
3.24V 4.95V 11.63V 11.62V
5 12A 20A 19A 19A 588.0W 68% .78 24°C/
3.19V 4.94V 11.48V 11.45V

The 12V rails dropped an average of .465V over the five load tests. That’s not very good and something I can only give a 5.5 score to. The efficiency was also mediocre at an average of 75%, so it scores a 7 there. Also, there’s no PFC. Although the power factor was decent for a unit without PFC, it only scores a 5 here.

I’d also like to point out how much the 3.3V dropped. A .19V drop is 6%. If the 3.3V rail wasn’t high, to begin with, we’d be under ATX specification on that rail.

Now, you may be curious as to whether I had the Turbo Fan Switch on or off. I had it off, but by the time I was to test three, the fan was already spinning at full RPM and the switch had no effect on the RPM’s of the fan.

Now for the test results from running in the hot box…

BFG Tech 650W – Hot Load Tests
Test # +3.3V +5V +12V1 +12V2 DC W/
Eff. P.F. In./
Progressive Load Tests
1 2A 5A 3A 3A 121.4W 77% .67 30°C/
3.39V 5.05V 11.90V 11.88V
2 5A 10A 7A 7A 250.3W 79% .73 34°C/
3.33V 4.99V 11.84V 11.81V
3 7A 14A 11A 11A 368.8W 77% .77 37°C/
3.28V 4.95V 11.75V 11.71V
4 10A 17A 15A 15A 482.0W 74% .77 38°C/
3.22V 4.93V 11.61V 11.57V
5 12A 20A 19A 19A 589.0W 69% .78 45°C/
3.17V 4.92V 11.47V 11.40V

As temperatures inside the case increased, the voltages certainly decreased. There was an average drop of .05V going from room temperature to the maximum temperature inside my case. 12V2 was on the verge of dropping below ATX specification (which would be 11.4V.) Because of all of this, it’s getting a score of 5 in the hot box test.

I also wanted to see how the power supply handled being put under a maximum load on the 12V rails while the 3.3V and 5V were relatively low. To do this, I put 19A on each of the 12V rails but reduced the 3.3V rail to only 3A and the 5V rail to only 4A. This dropped both of the 12V rails to 11.33V. Not until I increased the 3.3V to 5A and the 5V to 10A (total of 66.5W on the 3.3V + 5V combined) did the 12V rails pick back up to a barely acceptable 11.6V.