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PC3200 doesn't want to boot as 400mhz?

post #1 of 12
Thread Starter 
Yesterday I got some new memory (see specs), and if I go into the BIOS and set the memory to 400mhz it doesn't boot. Memory to "auto" doesn't boot either. It only boots when I set it to 333mhz, and that is still with the stock fsb speed of 166mhz. Now if I raise the fsb to 184 it still boots up fine, but I have to leave the memory at 333mhz in the BIOS. Any way I could fix this?
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post #2 of 12
Quote:
Originally Posted by Acoma_Andy
Yesterday I got some new memory (see specs), and if I go into the BIOS and set the memory to 400mhz it doesn't boot. Memory to "auto" doesn't boot either. It only boots when I set it to 333mhz, and that is still with the stock fsb speed of 166mhz. Now if I raise the fsb to 184 it still boots up fine, but I have to leave the memory at 333mhz in the BIOS. Any way I could fix this?
What timings? And are they double sided?
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by AMD-rules
What timings? And are they double sided?
Timings are currently at "auto". The sticks are double sided.
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post #4 of 12
Thread Starter 
Ok I found out the timings at "auto" are 3-3-4-9 and the FSBRAM rating is 1:1. Would it be wise to turn 1T command on in the BIOS? Currently it is off and the system doesn't boot at 194 FSB.

The PCI is also at 37Mhz and I read it should be 36Mhz max, but I have no PCI devices... might this be the reason why it doesn't boot then?
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post #5 of 12
PCI should really be 33Mhz max. Your hard drive controlers run on PCI so they might be corrupted if you run it out of spec.
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by Fishie36
PCI should really be 33Mhz max. Your hard drive controlers run on PCI so they might be corrupted if you run it out of spec.
So I can't overclock (more) because the PCI Mhz is already too high? There is no function for asynchronous PCI in the BIOS unfortunatly. Is there any way I could get it back to 33 Mhz? Besides putting it back at stock speed of course.
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post #7 of 12
In the Bios, change the Ram speed manually, to putting it to DDR400. This will disable the 'auto' mode, which might be messing things up.
post #8 of 12
Quote:
Originally Posted by Acoma_Andy
So I can't overclock (more) because the PCI Mhz is already too high? There is no function for asynchronous PCI in the BIOS unfortunatly. Is there any way I could get it back to 33 Mhz? Besides putting it back at stock speed of course.
Nope, if you don't have the option for asynchronous PCI (aka clock locks) in the bios then there's really nothing you can do to overclock your cpu. That's why overclockers use espensive motherboards with well known chipsets.
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post #9 of 12
Thread Starter 
I can change it to DDR400 but then it still doesn't boot. I can also change from SPD to manual and then I have to set the timings myself, but I have no clue about what timings I should do.

About the PCI I found the following settings in the BIOS:

PCI latency timer: 32
PCI delay transaction: Enabled
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post #10 of 12
if you change it to DDR400 while your cpu is overclocked you are overclocking your RAM too. That's probably why your system won't boot. When you set it to 333 then depending on how far your cpu is OC'd then either your RAM is underclocked, running DDR400 or a slight OC that the RAM can handle.

value RAM won't be able to be pushed much higher than 400Mhz. you should put your system back to default speeds and slowly put it back up in increments to see what your RAM can do.

use memtest to test your RAM's stability and
prime95 to test your cpu
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