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Issue with PCI_Express slot?

Last response: in Motherboards
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February 28, 2010 8:13:02 PM

My set up
ga-ep45-ud3r
HD5870
cosiar ddr2-667 2x2g
750 roswell power supply
E6500 processor
320 sata HDD
samsung lcd monitor

The problem im having is anytime i play a game i have a screaching sound coming from what it sounds like is my PCIE slot and it puts waves on my monitor only when its making this sound. I have tested the slot with two different graphics cards HD4830 and HD5870 and i get the same results. Has anyone heard of problems like this or a way to fix them or do i need to RMA the MB i have had it for 2-3 months so i would be sending it back to gigabyte meaning i would have to buy another MB in the meantime.

More about : issue pci express slot

a c 177 V Motherboard
February 28, 2010 8:49:08 PM

Check that your power supply is properly grouding to your case; many PSUs are anodized aluminum, and the damned screw holes get anodized as well - looks pretty, but anodizing is an insulator - I always do this:
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a b V Motherboard
February 28, 2010 9:32:53 PM

The screeching sound usually means the videocard is not getting enough power.
Roswell power supplys are near the bottom of the list as far as quality .They do not make their own but rebrand other manufacturers supplys.Some are good but others are crap.
You could try swaping some of the other connectors to a different 12v line to see if it fixes the problem.
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March 1, 2010 5:10:53 AM

Thanks for the answers,I have had my power supply for about 2 months and the problem has gradually gotten worse so it makes sense it would be the power supply I tried grounding it out like you said and switching connections and still had the same effect,what power supply would you reccomend so i wont have this problem again
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March 1, 2010 6:57:37 AM

Something I was wondering about in BIOS I have PCI express frequency option to set the clock between 90mhz-150,default is 100.
Also I have a clock drive setting that is default at 700mv in the owners manual it says default is 900mv so i set it to that it made a little difference but still the waves on my screen,do you think adjusting these will help?
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a c 177 V Motherboard
March 1, 2010 12:50:04 PM

If you're not OCd, the PCIe will work correctly at 'auto'; if you do OC, I recommend setting it to '100' (not 'auto'), and the auto divider does not work correctly for some chipsets at higher than stock Bclk...

Don't know about adjustments, as I haven't yet fathomed what might be wrong. My only experience with noisy components has been limited to bad, or poorly wound, inductors, and ground loops. You say you hear and see this playing games - does it only happen in games? Does it happen in every game you have? Do you ever get it in the OS, say when you're crolling a PDF? Are you sure it's 'comming from the slot'? The fans are usually PWM'd at a high audio frequency, and they might 'ring' at the switching frequency...

I don't know that it can really be a power issu, as tou get it with both cards, and the 4830 should lessen, if not eliminate it, if that were the issue. Have you tried changing to the other PCIe x6 or x8 connector on your power supply?
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March 1, 2010 7:25:28 PM

It only happens when I play games, and my HD4830 originally didn't have to problem but it recently started doing it.Al the fans normally run at a low rpm do to the case i have. The 4830 doesn't make the sound as bad and if I put everything on
low settings theres no sound so after hearing its a
psu issue it makes sense that would be it
I picked out Corsair CMPSU-750TX 750-Watt TX Series from the ati/amd website as being about the cheapest i can afford right now,is it a good psu?
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a c 177 V Motherboard
March 1, 2010 9:28:52 PM

Leaving 'headroom' for another vidcard in Xfire, a CPU overclock, and four DIMMs, I get around 500 watts, so a 750 should be great plenty... Whether you get a 650 or a 750, I would look for something with four PCIeX6, or two PCIeX6 and two PCIeX6+2 or 8's, just so you're 'covered' in case you want to add a second 5870 someday, either to Xfire for gaming, or to do this:

Corsairs are great, but a bit pricey...
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March 2, 2010 7:21:38 AM

I borrowed my cousin's roswell500w power supply and put it in tonight and it fixed the problem I was having so i ordered a new power supply thanks for the help.
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March 2, 2010 7:22:51 AM

Best answer selected by bran101010.
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