PDA

View Full Version : Can my 20 pin psu power a 24 pin perfectly?


Rev_Night
10-08-05, 02:10 AM
I am upgrading to a Epox EP-9NPA+ Ultra board + 7800GT, and i am wondering if my current PSU is good enough. I have a Thermaltake Silent Purepower 480watt in an Antec P180 case. This psu is a 20 pin connector, and the board is a pci-e 24 pin. I read on a massive guide over in the AT forums that certain PSUs can do 20 -->24 pins, but only the good ones. Apparently, you can plug a 20 pin into a 24 pin just some of the rails will have to work hard as sh*t. I already know i need to get a 1 pci - 2 molex power conversion cable for my pci 7800gt. Since this is a high performance rig, i of course feature stability and performance (and noise) above all else.

I read two PSU guides and they both said my current peak wattage was around 280.


Do i need to change to a 24 pin PSU? Are 20 -> 24 pin adapter cables good enough to be perfect? Do i need to do anything at all?

TierMann
10-08-05, 07:04 AM
The 480watt purepower comes with a 20-24pin adaptor, unless that's just in the one packaged with the lcd panel, but you can buy one seperately too.

http://www.thermaltake.com/purepower/a2169AdaptorCable.htm

Shocky
10-08-05, 07:16 AM
The 480watt purepower comes with a 20-24pin adaptor, unless that's just in the one packaged with the lcd panel, but you can buy one seperately too.

http://www.thermaltake.com/purepower/a2169AdaptorCable.htm

20pin plugs should work fine on ATX2.0 motherboards without the adaptor. Works great for me anyway..

Old 20pin Antec 550w truepower with Asus Sli Premium..

|MaguS|
10-08-05, 07:29 AM
My 20pin Sparkle is powering my board just fine... though I plan on getting a SeaSonic next week! :)

six_storm
10-08-05, 11:05 AM
If you feel a little paranoid, NewEgg sells adaptors for around $2 or so. I bought one but I found out I needed a new PSU anyways.

keith33
10-08-05, 12:06 PM
Don't try and get away with it with SLI. But temporarily with one card it should be pretty stable.

|MaguS|
10-08-05, 01:04 PM
Don't try and get away with it with SLI. But temporarily with one card it should be pretty stable.

If its a good PSU it will be as stable as a normal 24pin CPU. I know my board is 24ping and im stable as hell...

Rev_Night
10-08-05, 03:52 PM
Don't try and get away with it with SLI. But temporarily with one card it should be pretty stable.


temporarily? i am talking about forever. is taht still good?

keith33
10-08-05, 04:09 PM
My Asus A8N-SLI Premium wouldn't run games with my Thermaltake 480W but when I bought my Powerstream 600W it became 100% stable (I'm assuming due to the 24 pin native connector). But, this might be an isolated incident or be due to the fact that the TT wasn't powerful enough for my rig anyways, everyone else says it should be perfectly stable so you might as go ahead and try it before spending any money.

Rev_Night
10-08-05, 05:13 PM
will do. here are my specs:

AMD 3500+, 130nm, stock HSF
BFG 7800GT
Motherboard (see Below)
2x512 Mushkin ddr400
Maxtor 7200rpm 120GB HDD
1 dvd/rw drive
Audigy 2 zs
Floppy
Antec P180, two 120mm fans, one 80mm

Will the PSU still be fine with that?



Now, as for motherboards, the HardOCP forum is in a 'still between the Epox EP-9NPA+ Ultra and the DFI NF4 Infinity. Which board is better? I do not overclock, have sata, raid, or anything like that. I just want stable fast game performance.

uOpt
10-09-05, 12:17 PM
Even for heavy overclocks and overvolts on my DFI SLI-DR, my Zalman 400B with a 20->24 pin adapter is a very solid power base.

Dr.Nick
10-09-05, 12:24 PM
Im also using an adapter with no issues on an Enermax 550w. But that thermaltake psu has a very weak 12v line(only 18A?) so Im not sure how well it will work(although it should since your system is not loaded with cdroms and HDs). That is crazy tho, the 431w Enermax I got last week for my little bro put out 33A on the 12v rail:confused: As for boards both are great but if you are kinda new to this the DFI's are a little less user friendly.

uOpt
10-09-05, 12:31 PM
I should mention that while I have a SLI board I don't have SLI video cards in there.

Rev_Night
10-09-05, 01:16 PM
i am not new to computers at all, i have built my own and others for the past few years.



So here i am getting some confusion. I will prob. go with the dfi, but people are conflicted on other forums. On the xbit labs forum, a moderator sent me an im saying that my thermaltake was a very nice one and would work just fine with the adapter. Other people in the HardOCP forums said that my 18 amps on that 12volt rail was way too low. So i am confused. I try to keep things simple in my computer so the specs listed above is all i am ever going to have in there.

do i still need to get a new psu?

Rev_Night
10-09-05, 01:22 PM
also, i already have an extenstion cable on my psu power chord already. is it bad to have two addons to the main chord?

keith33
10-09-05, 04:40 PM
Nvidia recommends a power supply with at least 25a on the 12v rail for any 7 series card combined with any processor, you do the math. I personally couldn't shell out that much money into an ass kicking rig then live with a lack-lustre PSU. But that's just me and I went overkill on my PSU lol (see sig).

Rev_Night
10-09-05, 06:30 PM
where does nvidia make that rec.?

ok, here is what i noticed on the 7800gt websites.

For PNY, the brand that i am getting at compusa, says it need " A minimum 350W system power supply (with 12V current rating of 20A)". Mine is only 12V current rating of 18A. Yet on the nvidia website, all it says is a 350watt psu.

so what is going on?

Edit: so anyway, i am looking at the modular Antec SmartPower 2.0 SP-500. How is that psu for my rig above? I really like the idea of only using cables as you require them. How is that psu? any reviews?