I'm taking a look at the Coolmax CTG-850. I was looking at the
CTG-1000, but it was making an annoying ringing-buzzing noise and then
quit working in the middle of testing. It wasn't overloaded at all, so
I'm sure it was just a defective unit (happens all the time. No big
deal.) But I can't test something that doesn't work, so I grabbed this
back up 850W unit instead.
Coolmax is sold under the "Green Power" product line. What makes this
Coolmax "green" is the fact that it's RoHS complaint. This means that
the power supply, accessories and packing material contain no hazardous
materials. No lead in the solder. No HCFC's in the plastic. No Azo Dye
compounds. I think this is all fine and dandy. But something that bears
the word "green" should also be efficient and quiet. Today we'll see if
this power supply meets MY definition of the term "green."
CTG-850 comes with many cables and all of them are very nicely sleeved.
The 24-pin ATX has a break away for 20-pin motherboards and there is a
separate 4-pin and 8-pin connector.
Type of connector:
2 x 2 12V connectors
2 x 3 PCIe
8-pin Xeon/EPS connector
6-pin Xeon/AUX connector
5.25" Drive connectors
3.5" Drive connectors
SATA Drive power connectors
Fan only connectors (thermostatically controlled 12V only)
Coolmax CTG-850 has four 12V rails. I'll get to how the rails are split
up later, but first let's have a look at the label...
Max Combined Watts
Wait... I thought this was a 850W power supply. Well, it is. Unlike
some companies that would just give you the 230V input specifications
for the power supply (which are bound to be higher since the input
amperage is half what it would be in the US with 115V input) Coolmax
gives us ratings for both 115V and 230V input.
Below is what the PSU does with 230V input...
(w/ 230V input)
Max Combined Watts
reference I want to also include a photo of the 1000W unit. I know how
hard it is to find specs when you're shopping for something online.
It's not often the vendor shows what all the rails are, what they do or
their combined wattage capability. Note the 230V input table on the top
and the 115~230V input table on the bottom.
As you can see, the CTG-1000 has 100 more watts on the 12V rail and 90 more on the 3.3V and 5V combined than the CTG-850.
figure out what rails go where, Coolmax gives you a diagram of the
connectors and where they all go and the 12V wires are all color coded
with a stripe. No stripe for +12V1, black stripe for +12V2, blue stripe
for +12V3 and green stripe for +12V4.
Now here's a pisser... Everything is on +12V4.
maybe not EVERYTHING is on the +12V4 rail. But all of the peripheral
connectors, one of the PCI-e connectors and the 4-pin ATX+12V connector
are all on +12V4. The only thing on +12V3 is the two 12V leads that
feed the power to the board via the main ATX cable. The 8-pin EPS uses
+12V1 and 12V2 and the other PCI-e connector uses +12V1.
Let's try to figure this out logically. I'd want to use the PCI-e
connector that's on +12V1 and figure out a way to only use the two
+12V2 wires on the 8-pin EPS.
How you're going to go about doing that, I don't know.
for the load tests I made sure to put the bulk of the load on +12V4
where it would be if you couldn't figure out how to only have the CPU
on +12V2 and the PCI-e on +12V1. Maybe we should cut off the 4-pin
Here's some photos of the pages of the manual that show the break down of what connectors go on what rails...
Click for larger photo
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