Connecting ocz600w to HD4850..??

DoXz40

guyz i just bought an OCZ 600w powersupply and i have an hd4850 powercolor..but the problem here that this psu has 4 12v so u can see 12v1,12v2,12v3 and 12v4 and my 4850 has only one power slot so which one do i have to connect...some one help plzzzzz

my psu:http://www.ocztechnology.com/product...m_power_supply

the hd4850:http://www.guru3d.com/article/amd-at...--powercolor/6

bluedevil · *Last edited by bluedevil; 01-17-2009 at 10:30.*

that psu has four +12V rails to provide uniform distribution of power
you have to link the 6-pin pci-e connector to your video card and it will work with no problem

DoXz40 · 01-17-2009, 10:32 | posts: 8 | Location: Egypt

thanks bluedevil but what if i wanted to add another 4850 in crossfire so all i have to do is to connect another 12v cable to the other 4850...right??

millerman61 · 01-17-2009, 13:19 | posts: 9 | Location: Virginia

Quote:

Originally Posted by DoXz40

thanks bluedevil but what if i wanted to add another 4850 in crossfire so all i have to do is to connect another 12v cable to the other 4850...right??

That would be right.

james1o1o · 01-17-2009, 14:43 | posts: 27 | Location: Scotland

Does Having say 2 +12V rails with 15A each = 30A overall power?

Lavans · 01-17-2009, 15:06 | posts: 4,540 | Location: Austin

Quote:

Originally Posted by james1o1o

Does Having say 2 +12V rails with 15A each = 30A overall power?

Roughly, yes.

TheOak · 01-17-2009, 17:27 | posts: 46

Quote:

Originally Posted by Lavans

Roughly, yes.

I've always thought you're supposed to look at the 12V lines combined max wattage and devide that by 12 to get a more accurate amp output?

For example, my PSU has 2 12V lines, 22A each so 44 together but max combined wattage is 408W and that comes to 34A.

james1o1o · 01-17-2009, 16:12 | posts: 27 | Location: Scotland

Righty Good.

Lavans · 01-17-2009, 18:36 | posts: 4,540 | Location: Austin

I don't know how true that is, but what sense is there in complicating a spec like that? I would rather look at the amperage per rail than have to do the math just to figure if the PSU is adequate enough.

Makalu · 01-21-2009, 01:54 | posts: 4,197 | Location: Eugene, Oregon

Quote:

Originally Posted by Lavans

I don't know how true that is, but what sense is there in complicating a spec like that? I would rather look at the amperage per rail than have to do the math just to figure if the PSU is adequate enough.

but the individual rail current limits don't tell you what the unit is capable of outputting...for that you need to look at the combined rating as TheOak said and it doesn't matter if that is expressed in watts or amps and you do math to convert it to one or the other.

Lavans · 01-21-2009, 03:55 | posts: 4,540 | Location: Austin

Quote:

Originally Posted by Makalu

but the individual rail current limits don't tell you what the unit is capable of outputting...for that you need to look at the combined rating as TheOak said and it doesn't matter if that is expressed in watts or amps and you do math to convert it to one or the other.

That's all well and fine, but why burden yourself with unnecessary math when you have per rail amperage right there in the specifications? I personally would rather buy a PSU that has the amps I'm looking for stamped right there in the specs list than doing the math and hope it's right. You have no idea how many times I've seen a guru right here in these forums complain about an under powered card because they thought the PSU they bought was adequate enough.

Makalu · *Last edited by Makalu; 01-21-2009 at 11:47.*

Quote:

Originally Posted by Lavans

That's all well and fine, but why burden yourself with unnecessary math when you have per rail amperage right there in the specifications? I personally would rather buy a PSU that has the amps I'm looking for stamped right there in the specs list than doing the math and hope it's right. You have no idea how many times I've seen a guru right here in these forums complain about an under powered card because they thought the PSU they bought was adequate enough.

you don't get it...the per rail amperages that you are looking at dont tell you anything about what the unit will output.

The OP's OCZ has 4 12V rails with 18 amp current LIMITS...not 18 amp output. If it could output 18 amps on the rails that would total to 72A (which is 864W if you bother to do the math as I mentioned it doesnt matter if you express it in amps or watts). Obviously a 600W total power supply can't do 854W on the 12V's alone. The actual combined output of that PSU is 44a.

Same deal with what TheOak tried to tell you about his PSU. The sum of the individual rail limits is almost always greater than the 12V output. It's like you have a water pipe that is big enough to carry 100 gallons per minute but the water pump can only pump 50 gallons a minute. The size of the pump determines the upper limit of the water flow, not the size of the pipe.

Lavans · 01-21-2009, 19:48 | posts: 4,540 | Location: Austin

Quote:

Originally Posted by Makalu

you don't get it...the per rail amperages that you are looking at dont tell you anything about what the unit will output.

No, you don't get it. =P

I'm not talking about total output, I'm talking about per rail amps. I'm not saying that your wrong, I'm just saying that it's easier to find the approximate amp rating by looking on the box's specs list.

DoXz40 · 01-20-2009, 20:02 | posts: 8 | Location: Egypt

guyz i just bought the ocz600w psu but i was thinking do i have to put in the case in a way that the 120mm fan be facing the motherboard or to the top of the case..?

Lavans · 01-20-2009, 22:03 | posts: 4,540 | Location: Austin

Quote:

Originally Posted by DoXz40

guyz i just bought the ocz600w psu but i was thinking do i have to put in the case in a way that the 120mm fan be facing the motherboard or to the top of the case..?

Having the fan facing the motherboard isn't going to hurt anything, but having it face the top of the case will block airflow. Besides, more times than not a PSU can only go in one way.

Knox · *Last edited by Knox; 01-21-2009 at 06:07.*

Because two 18amp rail is not even roughly 36amp. No, power supply with two 18amp, 12v rails will ever put out 36amps total on the 12v rails. Ever!

Going to buy a psu in person rarely happens where i'm at. I'm sure it's the same way for many others hear.

I will agree that buying a psu in person, and looking at the amps is the best way to do it though.

morbias · **Memory**: 6GB HyperX @1600 6-7-6-18

But per rail limits aren't what's important unless you have some device sucking everything from one rail and hitting that limit, which nearly never happens unless the PSU has bad rail distribution by design.

99% of the time all +12v rails are connected to one source, which is why the combined output is what matters.

Lavans · 01-21-2009, 20:13 | posts: 4,540 | Location: Austin

I know ^_^

http://compreviews.about.com/od/cases/a/PSUWattage.htm

DoXz40 · 01-21-2009, 23:12 | posts: 8 | Location: Egypt

i got very confused right now because i was only reading the +12v rails on the box and adding them all but after all of this comments i don't know if i had made the right choice to buy this psu or not.....

Makalu · 01-21-2009, 23:59 | posts: 4,197 | Location: Eugene, Oregon

Quote:

Originally Posted by DoXz40

i got very confused right now because i was only reading the +12v rails on the box and adding them all but after all of this comments i don't know if i had made the right choice to buy this psu or not.....

you're fine with that PSU...your peak loads won't exceed 400W total and 350W off the 12V's with a second 4850 and the Pentium D. So something like 30A off a 44A PSU is no problem and the rail distribution for cards with single connectors like the 4850 is fine so no problem exceeding an individual rail limit.

Lavans · 01-21-2009, 23:19 | posts: 4,540 | Location: Austin

Unless you plan to Crossfire the HD4850, that PSU will work just fine.

DoXz40 · 01-21-2009, 23:46 | posts: 8 | Location: Egypt

so u say that this psu will not be enough in crossfire...dammit

barwell1992 · 01-21-2009, 23:52 | posts: 3,728 | Location: uk

erm i think it might be ok actuly im not sure my psu is pushing 60A in total and thats about enough for a 9800gtx+ sli rig so im a bit sceptical about ure psu pushin 2 of ure cards

DoXz40 · 01-22-2009, 00:30 | posts: 8 | Location: Egypt

soo it might be ok to add another 4850 in a soon upgrade for the motherboard and cpu..verysoon

Makalu · 01-22-2009, 00:46 | posts: 4,197 | Location: Eugene, Oregon

Quote:

Originally Posted by DoXz40

soo it might be ok to add another 4850 in a soon upgrade for the motherboard and cpu..verysoon

yeah...each 4850 draws about 110W...see here:

http://www.xbitlabs.com/misc/picture...r_full.png&1=1

so that's 220W for two...figure another 50 watts for drives and fans in a typical system configuration and that comes to 270W. The only other component that uses 12V power is the CPU. I dunno exactly which Pentium D you have there but average is about 8A(100w) for those...if you upgrade it's very likely the new CPU will draw less since they use a smaller die process. But anyway that'd be like 370W peak load if you stress every component at once...gaming doesn't do that btw...your game loads will be about 325W. So yeah about as I said before (350W off the 12V's) and typical load on the other rails will be 50-75W.

PSU loads should be kept under 75% total capacity for longevity and efficiency and 75% of 600W is 450W so your good all around I say.