RAM making pc slow

[VixP]

I bought a 1gb ram, to make my pc a total of 2gb. There were already 2 x 512mb installed on the first 2 slots. So I installed on the next slot to it. They have 2 different colors, first color is taken up by the 2 x 512mb. The next color has the one I just bought and have 1 left.

I looked by pressing ctrl+alt+del and it says 1.7gb is taken up and only like 7% of cpu is used. Why is it so slow now, I thought with a 2gb was going to be faster but it is slower then before. I used Everest to check my Ram type, PC 4200

 

[PC eye]

You mixed sizes not recommended for dual channel mode for one. The best move would have been to simply have gone for a matched pair of 1gb dimms. The new memory probably sees slower timings then the pair of 512mb dimms already in use. Another often seen recommendation when mixing different sized dimms is to install the largest or faster memory in the first dimm slot like A1 or Slot 0 or 1 according to the board's manual.

 

[oscaryu1]

It's probably slower because:

1) 512 x2 had better timings...

2) 512 x2 had a faster speed...

3) 512 x2 was in dual channel setup...

4) 512 x2 was performance and not value RAM...

 

[VixP]

I'll give that a try. Should I use the 2 512 on A3 and A4 or A2 and A3 with the 512's.

Edit:
Only difference was Standard Timing for 512 is 4.0-4-4-11. 1gb is 4.0-4-4-12. Technology for 512 is 8x(64Mx8), 1gb is 16x(64Mx8).

 

[PC eye]

The question besides timings would be the speed of the memory if both the 512s and one 1gb DDR dimms are all single or dual sided dimms? You can't mix single sided(IC chips on one side of the dimm only) with dual sided memory. Is the memory something like PC2100+, PC2700+, or PC3200+ ?