Big problems running X1900 in CrossFire

[Charles Wirth]

Im showing a draw of 8.2A in ATI tool on my XTX in 2D

The X1800 XT/XT PE voltages are higher by default than the X1900XT/XTX.

[5-Clicks]

Its says 12V1 16A, 12V2 16A and 12V3 36A - so its (16+16+36) 68A total..

One of these will do nicely too.
Runs 3.5GHz FX60 and X1900XT CF (OCed and increased voltage) smoothly.

That looks like 4 +12v rails 15-15-15-15 to me. The 3.3v rail has 36A on it...

[Tony]

Guys

Something to look out for, just because a manufacturer quotes OCP per rail does not mean you can draw that much over all 4 rails and be totally stable. The figures you see are just the OCP max per that line, nothing more.

OCZ are working on new PSU's, we have a new unit testing now and will be looking at a new enthusiast driven model shortly there after.

[GoriLLakoS]

OCZ are working on new PSU's, we have a new unit testing now and will be looking at a new enthusiast driven model shortly there after.

any other tip tony about these psus??????

[macci]

PS. Single Radeon X1800 XT shows 38,2 A GPU current draw regarding ATITool... I'm not so sure if this value is the true

38.2A at Vgpu is a bit over 50W which sounds about right.

[Syn.]

I always tought that my Thermaltake 680W PurePower will do me good even in crossfire. It has 3x +12v rails totaling 52A of +12v power. I am guessing thats why its Crossfire certified.

http://thermaltake.com/2005/purepower/w0049/w0049.htm

[5-Clicks]

I would have to say the PC P & Cooling PSU's are a little better made than OCZ. Has anyone heard of crossfire killing a 510 SLI or is this all speculation?

Thanks for proving my point

[s7e9h3n]

The Zippy 6701 has a 45A single 12v rail, but I'm not sure it supports sli.....I guess there's always the option of 2 x Zippy 6701's = 90A total

[macci]

That looks like 4 +12v rails 15-15-15-15 to me. The 3.3v rail has 36A on it...

Yes the Fortron/Source 700W PSU has those values.
The numbers I mentioned at the beginning of my post were for the 1kW PC Power&Cooling PSU, which was linked earlier in this thread.

[5-Clicks]

Ahh ok my bad Didn't pick up that you were answering the post above that one of yours

[Gnome]

Yes the Fortron/Source 700W PSU has those values.
The numbers I mentioned at the beginning of my post were for the 1kW PC Power&Cooling PSU, which was linked earlier in this thread.

seems like the seasonic s12 is under-rated those things could most probably take the intel + cf rig.

[macci]

seems like the seasonic s12 is under-rated those things could most probably take the intel + cf rig.

According to their website it provides only 36A (18+18) for 12V?
I have seen 600W Enermax (35A at 12V) and OCZ 600W (38A at 12V) shut down with stock F60+X1900XT CF (Enermax completes 3DMark05 with CPU at 2.2GHz 1.2V max, OCZ at 2.4GHz 1.25V max).
But then again I guess it also depends on how realistically they rate those power supplies.
For instance the 550W Coolermaster is rated for only 30A but it will run the mentioned setup nicely thru 3DMark05..

[5-Clicks]

Thanks macci, that's good info to know. It would seem that CoolerMaster is underrated in the PSU department, no?

[G H Z]

Hey macci,

Whats the difference in current draw between X1800 CF & X1900 CF? I think I remember reading somewhere around 10-15 watts more per card.

An OCZ 520 ran my 3.7Ghz FX & X1800 CF 830/940 no problems. Do you think PCP & P 510 SLI is adequate?

[NinjaWreck]

Hey macci,

Whats the difference in current draw between X1800 CF & X1900 CF? I think I remember reading somewhere around 10-15 watts more per card.

An OCZ 520 ran my 3.7Ghz FX & X1800 CF 830/940 no problems. Do you think PCP & P 510 SLI is adequate?

With a peak output of 650 watts I'd say the 510 SLI is fine.

[OC_newbie]

Ok everyone I bought the Fortron/Source 700W PSU with 60A, if Newegg.com ships it today I'll get it tomorrow!
I'll keep you all updated on what happens... btw I really wanted the pcp&c PSU's, but I didn't really wanna spend that much right now, maybe in a few months as I really like that 1k watt unit with almost 70A.

[5-Clicks]

With a peak output of 650 watts I'd say the 510 SLI is fine.

I don't think we're talking about wattage, more about the +12v amperage. The OCZ 600W has a peak of 700W, but the reason it's not holding up the X1900's CF is because of the +12v amps.

[NinjaWreck]

I don't think we're talking about wattage, more about the +12v amperage. The OCZ 600W has a peak of 700W, but the reason it's not holding up the X1900's CF is because of the +12v amps.

I would have to say the PC P & Cooling PSU's are a little better made than OCZ. Has anyone heard of crossfire killing a 510 SLI or is this all speculation?

[s7e9h3n]

I don't think we're talking about wattage, more about the +12v amperage. The OCZ 600W has a peak of 700W, but the reason it's not holding up the X1900's CF is because of the +12v amps.

I thought the OCZ was rated @ 600W peak? I can see how it may not be able to maintain a cf setup if that rating is in fact peak power. You have to factor in the psu's efficiency and then derive how many amps the rest of your system comsumes @ load and then you'll find if it can support the cf setup. That's maybe why the Coolermaster is able to handle the load since they're not rating the psu @ peak. Wattage is related to amperage in the sense that Amps X Volts = Watts...soooooo....

@ Ghz: Although I don't run anything close to CF or SLI, from what I gather from the info from Macci and others here - IF the 1900's draw an extra 10-15 watts per card, you'd be looking at an extra 2-3 Amp draw from the 12V rail. IMO, single 12v railed psu's function a lot better with the A64's that the ones with multiple rails. That's why those 520W OCZ psu's probably had less issues with A64's than the 600W versions. IIRC, the 520 uses a single 12v vs. the 600's dual 12v........

[RyderOCZ]

I thought the OCZ was rated @ 600W peak?

420W = 520W Peak
520W = 620W Peak
600W = 700W Peak

Page 2 here: http://www.ocztechnology.com/product...owerStream.pdf

[s7e9h3n]

420W = 520W Peak
520W = 620W Peak
600W = 700W Peak

Page 2 here: http://www.ocztechnology.com/product...owerStream.pdf

Ahhh....thx...I was looking for that

[Gautam]

Yes the Fortron/Source 700W PSU has those values.
The numbers I mentioned at the beginning of my post were for the 1kW PC Power&Cooling PSU, which was linked earlier in this thread.

I love Fortron/Source...probably the only company out there I can say I'm a fanboy of...heh. Always underrated and wonderfully priced. Looks like I found my next PSU.

[Charles Wirth]

Athena 850W

Output: +3.3@30A,+5V@55A,+12@48A,-12V@0.8A,-5@0.5A,+5VSB@2A

http://www.newegg.com/Product/Produc...82E16817104126

You can combine or split the 12v rail.

[s7e9h3n]

Athena 850W

Output: +3.3@30A,+5V@55A,+12@48A,-12V@0.8A,-5@0.5A,+5VSB@2A

http://www.newegg.com/Product/Produc...82E16817104126

You can combine or split the 12v rail.

Have you tried one of those psu's? It looks like a good psu on paper, but the packaging makes it look like one of those cheapo-not-performing to spec-psu's.....

[Sheik]

I am running X1900 Crossfire. Antec 550 WATT True Power just said no way and shut down on 3DMark06. I swopped for 700 WATT AOpen and now it runs OK.