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20 -> 24 pin

S

skullborg

n00b
Joined
Feb 24, 2006
Messages
27
I've got an Antec True 550watt power supply currently, in 20 pin style.
My new system is going to be an AMD 4400 X2, with SLI 7800's, 2 SCSI drives (10k) and a pair of 160gig SATA drives in RAID, plus about 6 fans, and a Audigy 2 Platinum (that requires an extra power connector too, geez).

I believe the power supply is going to be fine, I've already taken the power supply apart, and replaced the stock 80mm fans, with high-speed 92mm fans -- and that puppy moves some SERIOUS air now!

But, the only problem I have -- the antec is 20 pin, the new Asus SLI deluxe board is 24 pin...
Would on of those 20 -> 24pin adpaters work safely?

Thanks!
 
Just because you've made your PSU noisy doesn't mean it has enough +12V amperage to cope with all the new hardware you're going to run. Let's see, you've got a 4400+, two 7800s, a pair of SCSI drives, and so on, but you don't want to spend a little on your PSU?
 
It's still a pretty nice power supply, by all measurements. Just bought it in 20pin style because I didn't have a 24pin board at the time.

Still begs the question, are the 20 -> 24 adapaters safe to use?
 
skullborg said:
I believe the power supply is going to be fine,
Click to expand...

then youd probably be wrong
it isnt up for that

you need to add up the +12V draw

7800GTX will hit between 8 > 11A each
the 4400 will be 7.5A
plus drives fans ect (say 4A seek\runtime)

your best worse case being 27.5A
and worse being 33.5 (overclocked cards, more for overclocking the CPU)
assuming even a good derating curve for that Antec and it being in pristine condtion its very heavilly loaded during any seriously CPU and GPU intensive workout

your supply is rated at 30A before any derating curve is applied
unless your case is running outside in Antartica your likely be overtaxing it
it might work for awhile since its rare your pegging everything, (meaning GPUS + CPU)
its more likely youll get the same issues other overtaxed SLi configs have been experiencing
youve loaded it right upto and possibly past what its rated to do
and thats where it will start to seriously labor to keep load regulation under control
throw in any VAC irregularities or higher temperatures and youve got issues

since its right up near its rated load it will also age much faster accelerating its usable life
as that degrades issues will become very appearent

adapters are generally fine, bad ones might introduce a noticeable resistance to the +3,3V rail
 
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