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450W for 7900GTX?

Last response: in Components
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April 7, 2006 12:46:44 AM

hello,

I am thinking about getting a new 7900GTX OC. I am concerned about my power supply. Below I posted two links, one for my cpu set up, (basically) and one for the exact power supply. If somone could take a look and jot down some advice on if I should get a better psu or not, I would very much appreciate it.

CPU set-up ---> http://store.yahoo.com/directron/blackslisystem.html

PSU ---> http://store.yahoo.com/directron/rs450acly.html


Thanks!!!

More about : 450w 7900gtx

April 7, 2006 1:58:47 AM

I'm running mine with a 500watt add 2 dvd drives and a ls120 to what you see below along with 2 120mm fans, 2 80mm fans and an lcd temp controller on the front of the case. I'm also looking at 2 7900gts but I will go to a 600watt before upgrading the grafix.
April 7, 2006 3:12:36 AM

That PSU has 920 watts of input wattage, and 450 true watts of continuous power. Very good specs and under rated if compared to lower end PSU's.
If you need more juice, they have a true 550 watt one :wink:
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April 7, 2006 3:18:01 AM

Will the 450w be enough to push the full system + a 7900GTX ??

The video card requires at least A 400W PCI Express™ complaint system power supply (with 12V current rating of 26A or more). I'm not sure what my 12V rating is....

Thanks.
April 7, 2006 4:12:38 AM

These are my current PC specs...
Lian Li PC-60plus Black Aluminum Case (w/TR-3B Black Thermometer/Fan Controller 3.5” bay)
Opteron 175 (2x 2.42 GHz, 2MB cache, Socket 939, .09 micron, E6 stepping, OSA175DAA6CD)
ThermalTake BigWaterSE 12cm liquid cooling system complete kit
Asus A8R-MVP Motherboard (ATI Radeon Xpress 200 CrossFire, socket 939, SATA2)
HiS X1800XT Graphics Card (625 MHz/700 MHz OC core/1500 MHz/1600 MHz OC mem, Dual DL-DVI VIVO 512 MB PCIe)
ATI TV Theater 550 PRO Tuner (PCI TV and FM Tuner)
4x 512MB Corsair Micro Xpert DDR RAM (2-3-3-8-2T (spd 2-2-2-5-1T) TwinXP 1024-3200XL)
2x 74gig Western Digital Raptor Hard Drives RAID-0 (WD740GD RAID0 150gig Boot Drive)
2x 250gig Western Digital Caviar SE16 Hard Drives (WD2500KS storage and data)
Plextor 716AL Black 16x DVD/CD Burner (IDE slot loading type)
Antec TP-II 550 Power Supply (550 Watt ATX12V v2.0 PSU)
Dell 2405FPW 24-inch LCD Monitor (UltraSharp Wide Aspect Flat Panel Display)
Logitech G-15 Gaming Keyboard
Logitech Cordless Optical TrackMan
Case Fans 5 in total (2x SilenX 120mm intake, Adda 120mm exhaust blower, SilenX 92mm exhaust and SilenX 80mm Fan)

and according to FutureMark’s results ~ 4,935 3DMarks06 and 9,881 marks in 3DMark05 performs pretty well... IMO... ;) 

I bought a Kill-a-Watt power meter that you plug power cord into and it reports actual power usage from wall socket.
Surprisingly, my slightly overclocked PC and GPU while running 3DMark06 peaked at only 325 watts! also, this test was done while the TV Wonder was active in background running TV and several IE browsers were open plus a MS Word 2003 open too. This result only got me 4,777 3DMarks06 tho, it was intended for using more watts than high scoreing.
I kind of expected a bit more, basing this on results from specs and power draw hardware sites that you input hardware components like...

http://www.extreme.outervision.com/index.jsp

but I am pleasantly surprised, just thought some readers might be interested in someones real life and unbiased independent results.

Just another report, I am running my
TV Wonder in a transparent window,
have 3 IE browsers open,
MS Outlook open, and
AutoCAD Land Desktop open and working in it...
Wattage power draw is pretty steady at 180 to 190 watts...

So far the highest power draw I have seen is running 3DMark06 with TV Wonder running in background and that was at
325 watts peak

That is a lot less than I would have guessed.

Based on this information from my PC, I preclude that my AMD Opteron rig overclocked at 2420MHz from 2200 consumes
≤ 200 Watts at Idle
≤ 250 Watts during Boot Up

and
≤ 350 Watts at Max 3D Benchmarking using 3DMark06

Note: This is only the PC measured at outlet from the Power Supply, my LCD Monitor is not measured in these results.

That means that my particular PC is only requiring 250 to 270 watts at peak maximum load, and generally usage requiring ≤200 watts at 75% efficiency, yet consuming from the wall 350 watts, the difference being transferred as heat.
April 7, 2006 4:39:12 AM

I think it should be just fine. If you need more, go to a 550W.

For the record, my current specs & PSU:
AMD Athlon XP 2500 OC'ed to 2.4 GHz
1GB Geil DDR500
DVD-RW & CD-RW drive
4x HDDs
Radeon x800XT AIW
plus a WiFi card, Sound card, and about 8 fans.

I'm running all this on a 500W Enermax Liberty PSU. I have had absolutely no problems with the system being underpowered.
!