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Windows 7: HPET support

25 May 2010   #1
JoeW

Windows 7 Ultimate x64
 
 
HPET support

I have found this function in the BOIS in both my Vail x64 machine and W7 x64 machine. Brief reading suggests this should enable better 64 bit support however on both machines the driver won't install and I get a driver error for PCI Simple Communications Controller.

Does anyone know why the driver won't load or whether this will make any difference to performance on either machine?



W7: 16 GB Ram, SATA II HD on AHCI, Intel DG45ID mobo, HPET enabled

Vail: 6 GB Ram, 2 x SATA II on AHCI Native SATA, Gigabyte P965 mobo, HPET set to 64 bit.


My System SpecsSystem Spec
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25 May 2010   #2
mpcrsc562

Windows 7 Ultimate x64
 
 

I have a Gigabyte board, but AMD, and the HPET was enabled by default. Never had a problem with the driver, however. Would not the driver be included with the chipset driver package?
My System SpecsSystem Spec
25 May 2010   #3
spyknee

W7 Ulti/64, XP Pro/32
 
 

I just disabled it! Ran DPC checker, HPET was causing a 100ms reading. With HPET off, checker reads 5ms. FYI
My System SpecsSystem Spec
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26 May 2010   #4
JoeW

Windows 7 Ultimate x64
 
 

How are you getting 5s? I have disabled HPET and got 100s down from 150s.
My System SpecsSystem Spec
26 May 2010   #5
mpcrsc562

Windows 7 Ultimate x64
 
 

I disabled it too and it dropped to 49μs, with a spike to about 250μs--which was still lower than the 349μs it read with HPET enabled
My System SpecsSystem Spec
26 May 2010   #6
spyknee

W7 Ulti/64, XP Pro/32
 
 

Quote   Quote: Originally Posted by JoeW View Post
How are you getting 5s? I have disabled HPET and got 100s down from 150s.
Well, Its an SSD machine, cpu and ram are OC'd, and I have turned off a lot of windows services. Just lucky I guess??????
Easytune6 was also an issue. I was using it to monitor cpu and mobo temps. Caused a 4000 ms spike when running. I just leave it off now. Monitoring apps will affect this.
My System SpecsSystem Spec
26 May 2010   #7
Aphelion

Windows 7 Home Premium
 
 

Quote   Quote: Originally Posted by spyknee View Post
Well, Its an SSD machine, cpu and ram are OC'd, and I have turned off a lot of windows services. Just lucky I guess??????
Easytune6 was also an issue. I was using it to monitor cpu and mobo temps. Caused a 4000 ms spike when running. I just leave it off now. Monitoring apps will affect this.

5us... nice! I'm running at 10 or 11 consistently, with HPET enabled I'm at 50 to 60us.

So, how does your machine feel with low DPS latency, any problem running audio/video. I had to do a little more work in Win-7 to get DPC latency down, WinXP didn't require as much tweaking.

Ap
My System SpecsSystem Spec
27 May 2010   #8
spyknee

W7 Ulti/64, XP Pro/32
 
 

It ranges from 4 to 12.
My System SpecsSystem Spec
17 Aug 2011   #9
Starz

Win 7 Pro x64
 
 

I know this is an old post, but if the contributors are still around - Thank You! This helped me...
My System SpecsSystem Spec
Reply

 HPET support




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