Quote: Originally Posted by maciex
my original Ram is 2 GB Kingmax 1066 and wit it PC works fine now
but when i add bought 2 GB Kingmax 800 i will have BSOD sometimes immediately sometimes after a day
for now i only use 2 GB Kingmax 1066 the other is not in PC because it crashes
my BIOS settings are now auto
When you added the second 800mhz module, did you attempt to run it at 1066mhz speeds?
By adding lower speed RAM, you will have to manually adjust the existing 1066mhz modules to match the timings and voltages of the newer and slower 800mhz module.
Without knowing the exact module numbers, it's hard to give specifics.
But for a general example:
If the original 1066mhz module ran at 5-5-5-15 1066mhz @ 2.1 volts and the new 800mhz module is rated for 5-5-5-18 800mhz @ 1.8v - you will have problems.
In this scenario, you need to manually set the timings and voltages to match the slowest
ie 5-5-5-18 800mhz @ 1.8v
Also, some of the 1066mhz modules sub-timings could be more 'tighter' than the lower specced 800mhz can handle.
If the BIOS was left to AUTO, then the timings for the faster module will be set, and not adjusted for the slower module.
Plus if the voltage options were left on AUTO, you could have been overvolting the 800mhz module. As a general rule, DDR2 can take up to 2.2v before causing damage/issues. But, there are always exceptions to the rule
Some RAM just does not like being overvolted.
With the 1066mhz module in place, I'd manually set the timings/frequency/ voltages to match the 800mhz modules specs.
Then I'd remove the 1066mhz module and replace it with the new module with the looser timings to see if the machine POSTS, functions correctly. if it does - add the original module.