• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

Stable in XP32 but not in XP64?

O

onn2000

Member
Just wanted you guys to know that I just found out that my X2 3800 is stable with dual prime for 12 hours in Windows XP 32-bit, but not stable at all in Windows XP 64. So there's one reason why AMD overvolts by a lot, I guess.

Maybe the 64-bit part of the CPU needs more voltage than 32 bit?
 
To my understanding, running a CPU in 64bit mode obviously makes the CPU compute more operations in an alotted time. So in Theory when running in 'full 64bit mode' your CPU will be doing more than it is in 32 (feel free to correct me though). Do you have it overclocked? I you do it might not like the extra heat/load. can always give it a Vcore bump. 12 hours prime should be fine for everyday operation.
 
It wasn't even full. I was running WMP when suddenly it gave a BSOD and rebooted. Yes, my X2 is overclocked to 2.6GHz. From my experience, BSODs generally happen when the CPU is idle, not when it is at load. So I think there's more to 64-bit operation than I know of.

Edit: I reread your post and now understand what you meant by 'full 64-bit mode'. Yeah, you may be right. Just wanted to bring people's attention to this. Maybe now we have a new category of 'stability': dual prime stable in 64-bit mode. 🙂
 
my ran prime95 fine, but I got crc errors when I downloaded stuff and accessed webpages (all in XP 32-bit), so currently I'm down to 2.4Ghz, instead of 2650.
 
Update: Dual Prime ran fine in XP 64, but the BSOD I experienced before at idle has not happened again. Will keep idling and see what happens.
 
Biostud, you're just unlucky to get that CPU. My 3800 does 2.6GHz at 1.39V. Although as you can see, it's not stable in XP 64.
 
I think one of the possible reasons for the BSOD is that I am using Raid 0. Although I didn't have any issues during the installation and immediately after, many have got BSODs just like mine. Will try the 6.67 drivers during installation just in case. Will update later.
 
I've tried everything from integrating WHQL RAID drivers to decreasing RAM speed, but the only way I could get total stability was by increasing the Vcore a little bit. So there you go, guys. Being prime stable in XP32 doesn't mean it's stable in XP64. Take it for what it's worth. Now I have to run my X2 at 1.4V instead of 1.39V like before. I know it looks like too little a step, but the minimum voltages in the fluctuations are quite different, hence the stability.
 
I have been unable to find a stable Nforce 4 RAID driver for XP-64, so that may be a factor. However, I think that much of the reason that A64 chips tend to have so much OCing headroom is the fact that the majority of the people using them aren't running a 64-bit OS and aren't using all the features of the chip. AMD still has to validate them to be stable under 64-bit operations at a given clock speed of course, so must speed bin chips that would run much higher if just running 32-bit code. It would be interesting if some forum members would testif their OCs are stable under a 64-bit OS(Even a 64-bit linux variant running MPrime would be interesting to see).
 
Could be drivers, though if increasing VCore fixes it drivers wouldn't be the issue, I would think anyway. Could be that the motherboard has problems supplying sufficient power when the whle CPU is being utilized.
 
Originally posted by: aka1nas
I have been unable to find a stable Nforce 4 RAID driver for XP-64, so that may be a factor. However, I think that much of the reason that A64 chips tend to have so much OCing headroom is the fact that the majority of the people using them aren't running a 64-bit OS and aren't using all the features of the chip. AMD still has to validate them to be stable under 64-bit operations at a given clock speed of course, so must speed bin chips that would run much higher if just running 32-bit code. It would be interesting if some forum members would testif their OCs are stable under a 64-bit OS(Even a 64-bit linux variant running MPrime would be interesting to see).
Click to expand...

I'm running 64-bit xp on my rig and its running fairly smoothly. *knocks on wood*
 
It's rock stable at stock voltages. Since it was more stable when I increased the Vcore, I can only come to the conclusion that 64 bit processing requires more Vcore.
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top