How the hell is everyone? I've been gone a while, but I'm back to help all the n00bs with their questions. I figured I'd give Wusy and Crashman a break.
Anywho, I have a n00b question myself.
I just got 2x XFX 7800GTX Overclocked cards for SLI. My PSU is rated at 485 watts (it's an Enermax). nVidia and company recommends a 500 watt PSU for SLI. Anyone in here have a similar setup on a <500 watt PSU? I don't really wanna go blow another $100 to get 15 extra watts if I don't have to... esp since this one's only 6 months old.
I expect a reply from such dirty bastards as dhlucke, wusy, and crashman.
We haven't seen Wsuy since the forums changed to ForumZ. Not sure where he's hiding. Crash and DH are still around and I'm sure they'll stumble on this thread soon.
Do you have the EG495AX or the EG495P? If so, then either is probably sufficient. Stress it with benchmarks on install to check for stability and log voltages for spikes. It would be my first suspect if instability reared its ugly head, but it's worth trying.
Welcome back to the boards. Wingding is waiting with baited breath in the "Other"...
Well, it seems to be working fine w/ this 485W PSU. I played some pretty demanding games and the system is stable- no issues. However, I've yet to hook up some of my USB devices and 2 more hard drives- that'll be the true test.
For those of you out there considering going w/ SLI- 485W is enough with this configuration:
Athlon X2 4200+
2x XFX GeForce 7800 GTX's (factory overclocked)
2x WD Raptors in RAID configuration
4x 256MB DIMMs (DDR400)
Asus A8N-SLI motherboard
2x DVD/CD burners
1 Linksys wireless NIC
1) nVidia has to assume you have crap for a PSU. Enermax isn't crap.
2) nVidia has to assume you're using a P4D840EE. An X2 doesn't use nearly that much power.
I'm too lazy to go search, but some power consumption thing I read recently had an X2 pulling about 100w less than a P4 - gahh, I'm gonna have to look it up... that sounds outrageous at first glance... Anyways, the X2 pulls around 215w I think - maybe up to 235-ish - and add another 50w or so for the xtra 7800 (don't know what they use...) you're still well under 70% load on the PSU.
The monitor ain't all that great... it's an Hitachi CM721F (19 inch CRT). That's the next thing i'm going to upgrade. :-D Thinking of getting that Hitachi 19 inch LCD the site reviewed a few months ago. Newegg has it for $279. 12ms response time- good enough for me.
I've got 4 banks all filled with 256MB DIMMs. It's the Corsair 3200LLPT TWINX stuff. 2-3-2 timings. Right now they're still timed at CAS2 and I'm overclocked to 2.4Ghz w/ Hypertransport at 880mhz. Stable as hell. Haven't loosened timings... yet. >:-D It's funny cause I've had this RAM since 2003 and it's still going strong. I paid a fortune for it when it came out, $450 I think. It's like $200 for 1GB now.
I'm considering selling the processor on eBay and upgrading to the X2 4800+. I'm selling my old rig on eBay (P4 3.4Ghz, MSI 865PE, Radeon x800 Pro) and if I sell this processor I'll have the $700 needed for it.
Naw, that 85w is the maximum the CPU alone will ever draw (that's the way AMD does it - Intel is defined differently). Add 25 or so for the mobo, 15 each for hard drives, a few for mouse & keyboard, video card, etc., and you get the real number.
That's wierd. I have a nearly identical setup as yours. Only real difference is i've got the OC'd cards which eat more watts and you've got more RAM. But then again, I'm using all 4 of my banks. You would think that mine would have issues too. Maybe it's that extra 5 watts that puts me over the top.
I think you're right in surmising the mobo can't see that other 512MB of RAM cause it's not getting enough power.
I guess my PSU is at it's extreme limit then. LOL. I won't be adding any more crap to this baby till I get some dinero for a new PSU. :-D
Uh, replacing PSU's are such a hassle. Have to re-cable everything and re-ziptie everything. Not looking forward to it...
While Antec makes good psus The Neopower isn't as good as the Truepower, so it could be just over the edge of stability for that PSU.
I gues its possible the PSU can't power up just 1 stick, but that sounds wierd. I would think it would manifest itself as just instability - or maybe not power up some RAM some of the time or something like that.
Does it recognize a full gig when you pull your 2 1gig sticks and just leave the 2x512 in? (just for testing of course) If so, then you could be right - if not there's some other reason for it.
This is almost certainly a flaw in the motherboard. I would check Asus's website and see if there's a BIOS fix for it. If not, notify them of the problem. I doubt it's a temp issue cause my board runs that hot too. It's the shitty heatpipe design they're using.
I guess I won't be getting anymore than 2GB in the future w/ the board. :-)