Win 7 System Gets Unresponsive with new RAM

Asus P5kpl-vm desktop board
August 27, 2010 at 03:36:35
Specs: Windows 7 Ultimate x64, C2D2.8GHZ/4GB
Ever since I installed a new RAM I have been experiencing some problems. My system suddenly gets unresponsive. For example when I am browsing, watching a movie, using Youtube. The system suddenly gets stuck. The mouse does not move and the keyboard shortcuts to open task manager do not work. Nothing on the monitor moves. The RAM that I have installed is same as the old one.
These are my system specs:
C2D 2.8Ghz (E7400)
RAM: Kingston 2GB DDR2 (x2) - Total=4GB (The RAM speeds are also same.)
Mainboard: ASUS P5KPL-VM
Graphics: 9400GT nvidia.
Operating System: Windows 7 Ultimate x64

Everything is perfectly compatible with each other. Please tell is it a problem with the new RAM I installed.

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August 27, 2010 at 04:36:38

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August 27, 2010 at 05:44:16
If everything was working OK, then you added more RAM & everything went to hell, it should be obvious that the RAM is the problem. Use the link posted by X86, download memtest86, burn it to a disc, boot off it & let it run at least one complete test series. If any errors are found, the RAM is probably defective.

Also, double check your memory settings in the BIOS. Do not run AUTO settings. Manually configure the speed, timings & voltage as per Kingston's recommendation.

BTW, since the E7400 is a 1066MHz FSB CPU, you should be running either DDR2-533 or DDR2-1066. If you have DDR2-667 or DDR2-800, configure it to run at 533MHz (266MHz frequency).

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August 27, 2010 at 07:30:39
The two Kingston ram modules are the same only if the part number is the same.
Kingston lists KVR667D2N5/2G and KVR800D2N6/2G Value Ram for your mboard model.
If the part numbers are not the same, or if they are different and at least one part number is not listed for your mboard model, there's no guarantee they will be 100% compatible with being used together in your mboard .

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 are specified 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).

In the case of Kingston DDR2 modules, the specified voltage appears to be always 1.8v, the standard JEDEC voltage, even for higher performance modules.

If you run ram diagnostics and get ram errors.........
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:

...then run the ram diagnostics again.

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