I have an AMD Thunderbird 650MHz which I purchased last week from ComputerGeeks. (Yes, it's a TBIRD 650, it's an OEM Pull from somewhere resold by CompGeeks).
Anyway, I got 2 of them. I put one in a system I was building for someone else and it OC'ed fine to 750MHz.
I then put the second one in a nearly identicle system and it won't overclock. The system that worked fine was in a Stirling El-Cheapo case w/ 250W PS. The system that is giving me problems is an Enlight Medium Tower w/ 250W PS. (The rest of the system consists of MSI K7T Pro 2A Motherboard, Some M.I.C. "TopTech" AMD 1GHz approved Heatsink w/ Large Fan, and PC133 Memory).
The problem with the OC'ing is as follows: Everytime I would set the clock ratio manually to 7.0 or 7.5 it would save, exit the bios, and hang. NOTE: This CPU is NOT L1 Locked--all the bridges are connected from the Factory!
After the hang, I'd Power Off/On and the system would reset back to the default 6.5x. I noticed in the PC Health that the default voltage was 1.77 (a little high) and at one point I found that if I LOWERED the default CPU Voltage from 1.7 to 1.675 (which was a reported 1.75 in the PCHealth) it did let me overclock to 700MHz but not 750MHz (at any manual voltage between 1.6 and 1.8).
So, On a whim, I hooked up a 250w powersupply from another system (another enlight) and it will let me overclock to 750MHz no problems w/ the same settings that would NOT work with the original powersupply.
I'm going to see about getting the powersupply replaced (maybe even upgrading to a 300w), but, it's very odd to me that if it works at normal clock that OC'ing wouldn't make a difference.
I posted this for 2 reasons: 1) To see if anyone has had this happen before and 2) If not, maybe it'll help someone else if they are having trouble OC'ing.
Anyway, I got 2 of them. I put one in a system I was building for someone else and it OC'ed fine to 750MHz.
I then put the second one in a nearly identicle system and it won't overclock. The system that worked fine was in a Stirling El-Cheapo case w/ 250W PS. The system that is giving me problems is an Enlight Medium Tower w/ 250W PS. (The rest of the system consists of MSI K7T Pro 2A Motherboard, Some M.I.C. "TopTech" AMD 1GHz approved Heatsink w/ Large Fan, and PC133 Memory).
The problem with the OC'ing is as follows: Everytime I would set the clock ratio manually to 7.0 or 7.5 it would save, exit the bios, and hang. NOTE: This CPU is NOT L1 Locked--all the bridges are connected from the Factory!
After the hang, I'd Power Off/On and the system would reset back to the default 6.5x. I noticed in the PC Health that the default voltage was 1.77 (a little high) and at one point I found that if I LOWERED the default CPU Voltage from 1.7 to 1.675 (which was a reported 1.75 in the PCHealth) it did let me overclock to 700MHz but not 750MHz (at any manual voltage between 1.6 and 1.8).
So, On a whim, I hooked up a 250w powersupply from another system (another enlight) and it will let me overclock to 750MHz no problems w/ the same settings that would NOT work with the original powersupply.
I'm going to see about getting the powersupply replaced (maybe even upgrading to a 300w), but, it's very odd to me that if it works at normal clock that OC'ing wouldn't make a difference.
I posted this for 2 reasons: 1) To see if anyone has had this happen before and 2) If not, maybe it'll help someone else if they are having trouble OC'ing.
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