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Memory Compatability/Configuration error on Dell XPS420

gilbey666 asked
Last Modified: 2016-11-23
I have a Dell XPS420 with the original memory fitted, (Win 7 Pro 64)

2 off 1GB IRx8 PC2-5300u555-12-zz

I tried fitting two additional modules from an unused Dell Dimension 8400

2 off 1GB IRx8 PC2 4200u-444-12-zz
          DDR2 533 CL4

Would not boot giving reason as Memory detected but Incompatible or Unconfigured

Grateful if anyone could let me know if memory is incompatible or if I need to tweak something.

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