I don't fully understand!

[Diehard]

I just bought 1GB Corsair to upgrade my Z61t which has original 1GB ProMOS

-----------------------
With 2GB (ProMOS at the bottom), I have Vista Performance Scores

memory : 4.4
graphics : 3.5
gaming graphics : 3.1
---------------------
With 2GB (Corsair at the bottom), I have

memory : 4.4
graphics : 4.2
gaming graphics : 3.1
-----------------------------

ONLY Corsair

memory : 4.5
graphics : 4.2
gaming graphics : 3.1

---------------
Only ProMOS

memory : 4.4
graphics : 3
gaming graphics : 2.4


----> ProMOS slows down my laptop?
2GB and Memory score is decreased?

Any Ideas?

[pianowizard]

What are the CAS latencies?

You should run the benchmark at least five times under each condition and take the average, because the results fluctuate a bit.

[ulrich.von.lich]

I don't think the Windows Experience Index is always accurate. For instance, I got the same score (4.4) after adding another 1Gb memory stick to my T43. However I can feel the performance difference in reality.

The two 1Gb sticks are identical, and Lenovo branded. I don't understand the CAS latency but they both say CL4 I think.

[ryengineer]

I agree, Windows Vista experience score seems pointless to me also, just concentrate on the fact that your machine is more happier with additional memory now.

[Diehard]

After running CPU-Z

DRAM Frequency 332.4MHz
FSB:DRAM 1:2
CAS# Latency (CL) 5.0 clocks
RAS# to CAS Delay(tRCD) 5 closks
RAS# Precharge (tRP) 5 clocks
Cycle Time (tRAS) 15 clocks
Bank Cycle Time (tRC) 21 clocks

The same results for Single ProMOS, single Corsair, and combined both.

I think Windows Experience Index is base on something, and the different result means what it bases on is different!
So what is it?