16GB 1066MHz DDR3 vs 32 GB 667MHz DDR2

[drchristopher]

The subject of my last post got cut off so here I go again.

16GB 1066MHz DDR3 vs 32 GB 667MHz DDR2

I have two W7-U 64bit machines.

Dell T5400 desktop,
Processor - one-X5450 Intel Xeon (L2 Cache-2x6MB, 3.0GHz, 1333MHz FSB)
RAM - 32 GB PC2-5300 (667 MHz ECC Fully Buffered)
Hard drives - two 1TB 7400RPM RAID 1 (mirrored drives)
Video card - nVidia Quadro FX580 512MB GDDR3

Dell M6400 laptop,
Processor - one quad-core Intel QX9300 (2.53GHz, 1067MHZ, 12M L2 Cache)
RAM - 16 GB (DDR3-1066 MHz SDRAM,)
Hard drive – one Samsung 256 GB SSD PM800 series
Video card – nVidia FX 3700 M (1-GB DDR3)

The M6400 is noticeably faster than the T5400.

1) The QX9300 does not have Hyper-Threading capacity so I do not think there is any technological advantage over the X5450. Any thoughts here?

2) Could 16 GB of DDR3-1066 MHz SDRAM RAM be a better work horse than 32 GB of DDR2 667 MHz ECC Fully Buffered RAM, but if it is not the RAM what else could it be?

3) Any thoughts on if the HD speed could (also) be behind the observed speed difference between the two machines?

4) If I added a second Xeon X5450 processor would that noticeably increase my observed speed?

Thanks everybody in advance! Appreciate your time.

drchristopher

[Guest]

What is the purpose of use for each of the machines?

If we know what's for it gets easier to give a hand...

[Tekxpert]

I gave an answer to this post before but it got lost here somewhere??

[gshv]

[Tekxpert]