Colonel Sanders
Supreme [H]ardness
- Joined
- Sep 26, 2001
- Messages
- 5,582
Previously I was running an E6750 @ ~3.54ghz (see sig, since I haven't updated it yet). That was a FSB setting of about 444. Now I just bought a Q9550 CPU from a member here and am trying to get a decent OC out of it.
Previous user of this Q9550 said he was doing 3.8ghz (which is around 447mhz FSB @ 1.25v). I figured I would start a little under there and work my way up. Much to my dismay the highest FSB I can use (and get into Windows and run Prime) is only 400 (3.40ghz).
I have it set at the stock voltages all around except +0.3v on the DDR2 to achieve the rated 2.1v of my RAM, and the CPU is at its VID of 1.2375.
Also I have the RAM set to super stable 1:1 and lax timings just to take it out of the equation for now.
I have tried upping the vcore manually which made absolutely no change. I can get a post beep and bios showing 3.80ghz (and higher) but it immediately locks up, shots down, then reboots back to default bios settings. It does this regardless of vcore (I tried up to 1.31v) and FSB voltage (which I tried up to the max the board allows of +0.3v).
Anyone have any tips here? Why can't I do any decent FSB with this quad core when my Duo could hit almost 450 without any problems?
edit: Also just to add, with my Zalman CNPS9500 at stock 1.2375 vcore on the Q9550 my temps hit at most ~58c on the first core running Prime95, the rest are a few c lower. Programs like HWmonitor show overall core temp not exceeding 47c.
edit2: Google is my friend. Apparently the P35-DS3L is fantastic for overclocking Duo cores but not Quad cores, and just like my experience, most people can't get it much over 400-415fsb.
Previous user of this Q9550 said he was doing 3.8ghz (which is around 447mhz FSB @ 1.25v). I figured I would start a little under there and work my way up. Much to my dismay the highest FSB I can use (and get into Windows and run Prime) is only 400 (3.40ghz).
I have it set at the stock voltages all around except +0.3v on the DDR2 to achieve the rated 2.1v of my RAM, and the CPU is at its VID of 1.2375.
Also I have the RAM set to super stable 1:1 and lax timings just to take it out of the equation for now.
I have tried upping the vcore manually which made absolutely no change. I can get a post beep and bios showing 3.80ghz (and higher) but it immediately locks up, shots down, then reboots back to default bios settings. It does this regardless of vcore (I tried up to 1.31v) and FSB voltage (which I tried up to the max the board allows of +0.3v).
Anyone have any tips here? Why can't I do any decent FSB with this quad core when my Duo could hit almost 450 without any problems?
edit: Also just to add, with my Zalman CNPS9500 at stock 1.2375 vcore on the Q9550 my temps hit at most ~58c on the first core running Prime95, the rest are a few c lower. Programs like HWmonitor show overall core temp not exceeding 47c.
edit2: Google is my friend. Apparently the P35-DS3L is fantastic for overclocking Duo cores but not Quad cores, and just like my experience, most people can't get it much over 400-415fsb.
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