|"Product: Asrock / N-68s"|
The Asrock web site does not list N68-S
The closest is N68-S3
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My guess is you need to change the ram timing numbers in the bios Setup so they're a bit slower (higher numbers). You probably won't be able to perceive the difference the slower timings make, otherwise.
Sharing the ram with the onboard video drastically reduces the ram's bandwidth (max data transfer rate) - it as much as halves it (you can use a program such as one in Sysoft Sandra suite to confirm that).
When you install a video card in a PCI-E X 16 or a AGP slot, in almost all cases, doing so disables the onboard video, and if so, the onboard video port produces no video when there is a card in the dedicated video slot, the ram is no longer shared with the onboard video and the bios settings regarding that are ignored by the bios, and the ram is able to perform at it's full bandwidth.
I think it's quite possible that what is happening is the ram is producing ram errors when the ram is able to use it's full bandwidth.
Assuming all the ram you have installed in the ram slots is 100% compatible with using it in your mboard model (it might not be) , then the most likely things are
- the default ram timings in the bios are not correct for your particular mboard model, and/or your mix of ram modules has more than one voltage specified for it.
Some ram manufacturer's modules do not strictly adhere to the JEDEC standards that most mboards bioses use to determine ram settings.
In that case, the ram settings in the bios Setup that the bios has automatically chosen may not be correct.
Check the ram settings in your bios - the ram voltage, and the ram timing numbers - those should be the same as for the specs for the modules themselves. Often the ram voltage and timing numbers are printed on the label on the modules.
If the voltage setting or timings settings in the bios are different from the specs for the ram, change them in the bios. The timing numbers must be as close as you can get to the same, or slower timings (higher numbers = slower) - you won't notice the difference the slower settings make.
If you have a mix of different modules
- don't mix ram that different voltages arespecified for - the bios will force the ram to use the lowest voltage, if "by spd" or similar is used (default settings) - ram that a higher voltage is specified for is more likely to not work properly in that situation.
- the bios settings must be those for the slowest timing settings of all the modules, or slower (higher numbers = slower).
- OR - at least one of the ram modules was made by an "also ran" ram manufacturer. According to info the Mushkin web site, some "also ran" ram manufacturers rate the ram timings of their modules when only one module is installed in a mboard, such that the ram timing are a bit faster (lower numbers). When more than one ram module is installed in a mboard, those modules may produce ram errors. If you change the ram timing numbers in the bios so they are a bit slower (higher numbers), the ram works fine.
e.g. we've heard of people having to do this several times for G.Skil ram .