BitFenix Whisper M 750W Power Supply

It’s an exciting day here in the lab. I’m looking at a brand new unit from a company I’ve never seen before – Bitfenix. They’ve sent their brand new Whisper M 750 watt model, a fully modular 80 Plus Gold offering that looks to take on the competition head on. Come on in, and I’ll go ahead and run it through the wringer.

PRODUCT: Whisper M 750W
PROD LINK: Whisper M Product Page
PRICE: $119.99 @ NewEgg
Price is at time of testing!

BitFenix Whisper M 750W

Shh. BeQuiet. No, wait… this is no BeQuiet at all, is it? Huh. I got a little confused, there, didn’t I? In fact, we’re looking at something from a company we’ve never seen at the site before, Bitfenix. They’ve sent us a Whisper 750 watt unit from the looks of this here box.

And it’s a 750 watt unit with “Silence Performance.” I assume they must mean “silent.” Well, we’ll just have to take their word for it, won’t we? It’s the way it always goes for us here at the site. In order to do any actual load testing, we have to do it loudly. Load testers are not silent creatures, so getting any kind of acoustic data for you is impossible. Fortunately, there are a lot of other things we can test, like how well a power supply does the job for which it is intended. We can test things like load stability, efficiency, and ripple control. So that’s what we’ll do again today.

Bitfenix is already off to a good start, here. 80 Plus Gold and a seven year warranty? Yes, please. Let’s look at the box some more and see what else this thing has going on.

BitFenix Whisper M 750W

Hmm… I expected marketing on the back, but we mostly have a lot of useful data here. Cables and their lengths, a shot of the modular connectors, a load table, dimensions… I can’t say I object as long as the load table matches the one on the unit itself.

BitFenix Whisper M 750W

Oh, there’s the marketing. Bitfenix does not say on here what we can expect temperature wise, but their site claims this puppy is good for fifty degrees at full juice. I don’t know if we’ll get anywhere close to that later, as the unit is both rather small and a quad 12V design, but we’ll make those hay bales after the farmer’s daughter stops rolling in the stuff.

Up to 92% efficiency? That’s always good, though Gold does not require it. Most Golds can’t do that at 120 volts line input anyway. FDB fans are always welcome, as long as they’re good ones. I’ve personally lost the ability to tell which are any good anymore… I had a fancy new TNB fan die on me over in the crypto mining room after less than a year of 24/7 use, so I’m pretty low on trust for most fan technologies lately that aren’t good old dual ball bearings. I’ve simply had too many sleeve bearing based fans fail over there.

What? You want a breakdown? Ok. On units that don’t perform well, I take their fans out and use them to cool my crypto rigs. 135-140mm models only. The ball bearing fans are holding up fine running at full go 24/7. Most traditional sleeve bearing fans are still working. Most FDB fans are still working. I’ve only had two of the crypto rig cooling fans fail – both were FDB. The aforementioned TNB 120mm fan was Rosewill branded, cooling an R9 270X. And don’t even get me started on stock video card cooling fans. They all suck. All of them. All. Of. Them. Even the ones on my Asus triple slot 7970s. Most of my crypto mining video cards no longer have their stock fans on them.

What’s still working over there? Well, for Tahiti based cards, I stockpile 120x38mm Delta, NMB-MAT, Nidec, or other 160cfm industrial grade monster fans. Ball bearing, of course. Never had any ball bearing fan fail. Pitcairn based cards don’t need that kind of airflow, so I run CoolerMaster Jetflo fans on them, the ones with the POM (wonderful?) bearings… those seem to hold up. Hawaii cards? Most of those are reference blowers, and those tend to hold up. Still waiting for the first Hawaii to lose a fan.

So here’s my take on fans. You have a warranty. If the fan dies, use it. Make sure it’s a long warranty if the fan isn’t known to be a good one. I will still score a fan if I don’t think it will hold up, but I think I’m moving toward a warranty based scoring method on them. Long warranty with FDB fan? We’re good. Short warranty? That tells me you don’t think things will hold up, therefore I should think things won’t hold up. Sound good? Well… it’s either that or I stop scoring fans entirely, or score fans excessively by punishing every TNB, FDB, rifle bearing, or sleeve bearing fan that comes into this lab. They are the only fans that fail on me over in the mining room. As it is, I think I’m going to require a five year warranty. No gray area – you either get the whole fan point, or you lose the whole fan point. We seem to have gotten to the point where silence comes with a detriment to longevity, and I don’t think I like that.

That was a long rant. We still have more marketing to mention. I like that Bitfenix has gone to the multi-rail camp on this one… the single 12V thing being better is simply not true as long as multi-rail is done right. From the way the load table on the box looked, it’s done right on this one. Japanese caps? Industrial protection? You guys know I love all that stuff.

BitFenix Whisper M 750W

Now that the wall of fan ranting text is over, it’s time to unpack. So far, we have a power supply, a bag of stuff, and a manual. The manual is pretty fancy but covers what looks like every Bitfenix model and is somewhat lacking in detail. There’s no mention of the max operating temp for full power, and it’s somewhat vague on rail assignments per cable.

BitFenix Whisper M 750W

Inside the bag, we find some modular cables, some zip ties, and some screws.