PCI-express seems to slow down the system

raa125

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Mar 10, 2014
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This one I expect will be a bit of a challenge but I really hope someone can answer it because I am at wit's end with this.

I recently bought an HP DC-5150 minitower on eBay. By itself it did not have much, just 4 gigs of memory and an Athlon 64, but it was what I needed in order to do some of my school projects (I need to use Adobe Creative Cloud - no if's, and's, or but's, it just has to be done, so naturally a 64-bit system with a 64-bit operating system is required). So I added in my own hard drive (since it didn't have one), and installed Windows on it.

I've also installed a Belkin Wireless card on it since it's needed in order to access the network here.

I was also hoping to play World of Warcraft on it, something which I expect my old MacBook will no longer be able to do come next year with the new expansion - so naturally I needed a video card, because the on-board just will not work for that.

Here is the problem - two PCI-Express video cards have been installed in the system at different times. Both have hurt performance substantially, rather than helped. The first was an ATI HD2400. Suspecting the slowdown was a power supply issue, I went and ordered a new power supply with some adapters, instead of the 250w that was in there before it is now a 500w.

So I tried again at updating the video card - this time an ATI HD4850 under the new 500w power supply. Same deal - it's a bit better this time but it's still horrendously slow. Without these video cards the system runs beautifully - a bit slow but nothing unbearable. As of now, MMC.exe snap-ins just give up on boot-up, because the system is so slow they barely even work.

Right now, the system is using Windows Server 2008 R2 (a free Dreamspark license version), but the problems were exactly the same when it was using Windows 7 Professional 64-bit.

I've tried updating the BIOS - the old one was released in 2006, the new one is 2007.

As I've said previously - I need to use a 64-bit OS since the software for my school projects requires it.

The motherboard is an MSI 09AC and supports only PCIe 1.0. The new video card (not sure about the old one) is a PCIe 2.0 - however I have read on other forums that the PCIe 1 should still run it, just at reduced speed. (Either way, it still would've been better than the on-board)

I know I am asking a lot for such an old system but it really does not seem to be anything it cannot handle. With everything minus the video cards, it works fine, both in Windows 7 and 2008R2. Why would installing one PCI Express video card slow it to a crawl like this, on both named OS's?

Yes, I know someone is going to ask, so I've saved some system reports, too, feel free to nosy around all my muddy hardware settings, maybe you can find something I missed. I am really hoping it's just a bad BIOS setting or a missing driver.

The reports are stored here: http://www.sendspace.com/file/ct7im6

Please help me if you can, and thank you in advance!
 

raa125

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Mar 10, 2014
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This problem is now solved.

It's a device driver called "HDAudBus" - which is in English called "High Definition Audio Controller". This device driver, unbeknownst to me, was eating up all my CPU resources. As soon as it was disabled, the system started functioning as I should've expected it to.

And the best part is, it did not affect my sound. I hope that someone else may find this answer useful. It took me a full 3 weeks to finally find this.
 

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