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4870 Power Needs

post #1 of 16
Thread Starter 
Hi folks, new here but been looking around for awhile. Anywhoo....Just got a Sapphire 4870 upgrading from an 8800gt. Have also gone from a 19 crappy monitor to a Samsung T200

Right heres the problem, the other day my board broke (965p-ds3, I always had problems overclocking my e6300). So picked up a p5q pro. Tried overclocking, nice and easy, straight to 2.8 and further. Fired up crysis to run some benchies, and the pc restarts. This has happened in every game Ive tried F3, FC2, Grid. Tried running the cpu at stock (annoying cause its such a bottleneck) and managed to get about an hour from crysis, then falls over again.

Do I need more power, maybe unplug a couple hard drives??

Specs:
Akasa 500w
E6300 Stock
P5Q Pro
3GB Xms2 800mhz [2x512,2x1]
3 Sata HDs
Xfi Music
Sapphire 4870
Couple case fans.

Would I get better performance putting the 8800gt back in and overclocking the cpu till i get a new power supply, if thats the problem.

Sorry for the long post and If its in the wrong place had no idea where to put it.

Laters
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post #2 of 16
Anything over heating? Are you positive you have a %100 stable overclock?
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post #3 of 16
500 watts by itself is plenty. As for the quality of your PSU, I can't say.

You should be fine with the power department for now.

I would try running your computer at stock and then playing those games again. It's more than likely a bad overclock. Maybe your CPU is overheating after the 1 hour?
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post #4 of 16
Quote:
Originally Posted by dr4gon View Post
I would try running your computer at stock and then playing those games again. It's more than likely a bad overclock. Maybe your CPU is overheating after the 1 hour?
He said he tried running it at stock already.
    
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post #5 of 16
If it was a 500w Corsair, I'd say the PSU isn't your problem. But since it's Akasa, I'd say it's possible (even though they're still pretty decent). 500w is supposedly the minimum anyway for a 4870, and if your PSU has aged somewhat, it could be pushing it. Do you have sufficient ventilation in your case? How are your temps on the video card (and elsewhere)?

If you're running at stock fan speeds, it's possible the 4870 is a bit toasty. Monitor temps while playing games or running stress tests. It could be shutting off because of poor cooling or a cramped, dusty case with bad air flow.
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post #6 of 16
Thread Starter 
Fast replies, cheers guys. Yet its 100% when it is clocked. Can run orthos 24/7 at 55 degrees. Soon as I fire up a game and it gets going, it falls over. Leading me to believe its the psu. Maybe its just a crap one. I did try and get a good one though, my original build was for overclocking! Mmmmm.......
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post #7 of 16
Quote:
Originally Posted by Sly.aces View Post
Fast replies, cheers guys. Yet its 100% when it is clocked. Can run orthos 24/7 at 55 degrees. Soon as I fire up a game and it gets going, it falls over. Leading me to believe its the psu. Maybe its just a crap one. I did try and get a good one though, my original build was for overclocking! Mmmmm.......
OK, but what's the temp on your video card? It sounds like it's your video card temps or the PSU.
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post #8 of 16
Thread Starter 
Havent looked at the temps of the GPU when in game. Will give it a bash just now. As idle Ati CCC is reporting 38 C fan 38%.
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PowerCase
Antec TPN 650w Antec 300 
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My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 950 Asus X58 Sabertooth 1GB GTX460 SLI Patriot Sector 7 6GB DDR3 1600MHz 
Hard DriveOptical DriveOSMonitor
2 x Corsair F80 (RAID0) N/A Windows 7 Professional 64Bit Samsung P2450 
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Antec TPN 650w Antec 300 
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post #9 of 16
It's not about the 500w, it's about the amount of watts allocated to the dual 12v rails. I cannot find an akasa 500w label on the internetz, they don't have much info about their product.

Here's a thread discussing the product: http://www.tomshardware.com/forum/24...fficient-power

But they don't really get anywhere that would tell you how many watts are allocated to the 12v rails.

If it shows the 12v rails with a space below signifying the wattage spread across the rails you can use the formula in my sig to see how many amps are on the 12v.

I wouldn't think it's that, vid cards usually use much less than what they're specified for, but if you've got some abnormally low amperage on the rails it COULD be that.
    
CPUMotherboardGraphicsRAM
E2180 @ 3.56 (Stable) 445*8 1.262v DFI BloodIron P35-T2RL MSI GTX260 G.SKILL 2 x 2GB DDR2 1000 
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Seagate Barracuda 7200.11 500GB 32MB cache Windows 7 x64 19" from 1999 (1600x1200) BFG GS-550 
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CPUMotherboardGraphicsRAM
E2180 @ 3.56 (Stable) 445*8 1.262v DFI BloodIron P35-T2RL MSI GTX260 G.SKILL 2 x 2GB DDR2 1000 
Hard DriveOSMonitorPower
Seagate Barracuda 7200.11 500GB 32MB cache Windows 7 x64 19" from 1999 (1600x1200) BFG GS-550 
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post #10 of 16
I think I've seen two different models. One had two 12v rails, 18a each. Another had two 12v rails, 20a each.

Either way, that might be pushing it, not sure. Your idle temps seem fine. Try watching temps while using something like FurMark after 8 minutes or so.
Edited by smoothjk - 12/18/08 at 9:05am
Blackie
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Hard DriveOptical DriveOSMonitor
Barracuda+Caviar Blue (1 TB) Samsung DVD burner Windows 7 Home Premium 64-bit Samsung T240HD 24" LCD (1920x1200) 
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Razer Lycosa Antec EA650 CM 690 Logitech MX518 and Razer Salmosa 
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Steelpad 5L 
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Blackie
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X4 970 ASUS M5A88-V EVO Radeon HD5850 1GB 4 GB DDR3 OCZ Platinum 
Hard DriveOptical DriveOSMonitor
Barracuda+Caviar Blue (1 TB) Samsung DVD burner Windows 7 Home Premium 64-bit Samsung T240HD 24" LCD (1920x1200) 
KeyboardPowerCaseMouse
Razer Lycosa Antec EA650 CM 690 Logitech MX518 and Razer Salmosa 
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Steelpad 5L 
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