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Coolermaster 430W PSU good enough for my upgrade?

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May 23, 2007 6:50:20 AM

Hey guys!

I have a Coolermaster RS-430-PMSR 430W PSU.

Link from newegg:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I am thinking of doing an upgrade to my system, a fairly cheap upgrade to:

AMD Athlon 64 X2 3800+ Toledo 2.0GHz Socket 939 Processor
ASUS A8V-XE Socket 939 VIA K8T890 ATX AMD Motherboard
Corsair 2GB DDR2-675 XMS2-5400 Xtreme Performance Memory
using a
ATI X1900GT or a X1950GT Video card

will my current PSU work fine for these? I use everything at stock, I dont overclock. I've been browsing the forums trying to find somebody with a similiar setup to see what kind of PSU they use but couldnt find a for sure answer.

Thank you for the help! :D 
May 23, 2007 7:18:25 AM

awesome, thank you for your help! :D 

when you mean combined +12V rails, you mean the +12V1 and +12V2, add the amps below them together to equal the amp I need?

such as for one example, one of your PSU listed has a 22A under the +12V1 and a 20A under the +12V2... add the 22 and 20 together and tada! higher then what you said I need?

:D 
May 23, 2007 9:49:03 AM

No, those ratings are just the total amount of power that rail can handle without failing. Adding 'em up won't get you anywhere. The PSU 101-102 sticky at the top of this section explains how to calculate amperage.
Related resources
May 23, 2007 11:59:49 PM

thanks for the replies guys.

some more noob questions. :D 

i saw the equation to calculate amps, W/V=A... i checked out the ref list and did some calculations to see if Im using the right numbers and it seems like I am... so I took this equation and popped it into my current PSU and I got 32A... im doing something wrong arent i.. :cry:  385 / 12
May 24, 2007 12:38:31 AM

Well for your PSU, it is 385w max for the +3.3/+5/+12v combined, so you just have to split it up accordingly.

For modern systems I usually give 100w combined for "typical loading" (of non-oc, bare bones sytems) on the +3.3/+5v, rails - so the remainder is available to the +12v. So...

385w-100w=285w, since we have +12v only we can calc for amps...
285w/12v=24A.

However... We have a fixed hard limit of +12v@19A or 228w max on your unit. Why is that you may ask? Well look at the total +3.3/+5v is rated for 210w max, which is pretty high... Which was normal for a single-rail "legacy" ATXv1.3 unit way back when the +5v fed the motherboard for the CPU power. "Modern" systems have an ATX+12v 4 or 8 pin CPU connector, so the demand for +12v increased while the +5v decreased. Hence, ATX v2.x was born and dual +12v rails became standard.

So your power supply is an excellent legacy replacement, or maybe if you are going to perform a dual PSU mod that would work well since you are effectively adding a "second rail" via another power supply.
May 24, 2007 4:09:23 AM

Sorry doolittle but it doesnt work that way. You cant do:

total power - (5V + 3.3V wattage) = 12V wattage

You MUST already know the combined 12V wattage SEPARATE to the rest.
May 24, 2007 5:38:07 AM

thanks for all the replies guys, really appreciate it :D  .

I was going to just pick one of those PSU on the beautifully crafted ref list but then saw this on newegg... seems to fit the amp i need too! what you guys think? =)

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

the label on the PSU is nicely labeled!
May 24, 2007 5:46:09 AM

STAY THE F*CK AWAY FROM ROSEWILL!

Their units suck. I would only use a Rosewill psu in a persons PC if I really wanted them to have a dead computer.

Pick one off the list that mpilchfamily put together, all are awesome quality units.
May 24, 2007 5:51:08 AM

There is one guy on here who will shoot you for blaspheming his precious rosewill :lol: 
May 24, 2007 8:45:14 AM

haha wow im glad i checked this thread again, I almost bought it! hehe, thanks again for all the help guys!

you rule! :D 
May 24, 2007 11:09:11 AM

random/mpilch

you both misread, I was trying to explain why older atxv1.3 units with a single +12v rectifier won't work in a modern system but work well for older boards that feed the CPU from the +5v - the unused potential that would normally be available to a dual-12v rectified system just isn't there.

yes that unit will not have the capability to support the 24A on a single rectifier but if it had a second rail of 15a max / 19a peak then it would be no problem. I use 100w since I measured my system bare-bones at 80w for the +5/+3.3 so just overstating slightly. Have not tried on a ddr2 system as of yet but should be similiar unless you are running a disk array and/or memory overclocking.

Perhaps you just didn't read the second paragraph at all and just the 24A part - so it was worded poorly after I re-read it
May 24, 2007 11:26:06 AM

I have not thought to do this on the psu calc to guesstimate the +5v/+3.3v load, however I found the results very interesting...

Quote:
eXtreme PSU calc"]Motherboard: Regular - Desktop

RAM: 2 Sticks DDR SDRAM

SATA HDD: 1 HDD

DVD-ROM Drive: 1 Drive

Keyboard and mouse: Yes

System Load: 100 %


Recommended Wattage: 98 Watts
[/url]
:wink:
May 24, 2007 1:37:58 PM

Quote:
If we use the actuall numbers from the PSU then we get, as mentioned above, 385-210=175. So 175/12=14.58A.


Using this logic, the corsair 520w is only good for +12v@30a... The corsair 520w label, states:

+3.3/+5=140w
+12v=480w
-12/+5vsb=25w
total=520w

To test your theory, let's omit the +12v@480w and subtract the -12/+5vsb to get the +3.3/+5/+12

+3.3/+5/+12=520-25=495w

And finally, take out the +5/3.3 max... +12v=495w-140w=355w or 29.5A max
IMO that is a bit low.

Using my true 80w measured for the +5/+3.3, we get 495-80=415w/34.6a
which is a much more "realistic" attainable +12v power when "typically loaded"

The capacity may be there for +12@40A however that does not give much room for the rest of the system. However, that would make it an excellent dedicated GPU PSU with that much on the +12 and so little left over for the other rails :p 
!