[Mark_89]

Hi,
I have to buy a workstations for CFD calculation and i would have your opinion about the rate velocity/price:

1) Double Xeon 2623 v3 (4 cores for 1 CPU, 8 overall) at 1866 Mhz memory speed (8 overall memory channels)
Ram 8x4Gb at 1866 Mhz DDR4

2) Single Xeon 1650 V3 (6 cores) at 2133 Mhz memory speed (4 memory channels)
Ram 4x8Gb at 2133 mhz

The first costs 2800 € (about 3400 $)
The second costs 2100 € (about 2600 $)

Even if the second has a quicker RAM, I think the first is better because has 8 memory channels, but how much is the first is faster? 5%-10%? On your opinion is it good to spend 800 $ to have this increase in simulation speed?

[CapSizer]

To a first approximation, you have a memory number of 8*1866 = 14928 for the dual Xeon system and 4*2133 = 8532 for the second system. Plus you have 33% more cores in the dual Xeon setup. A rough thumb-suck would be that you could easily expect at least 50% more throughput from the dual Xeon. If you have the cash, the more expensive option is undoubtedly a better choice.

The viable alternative would be two networked Core i7's, which might be better value for money than either of the two Xeon systems. Having said that, I've had at least one dual-socket workstation next to my desk for nearly all of the last 15 years, and I've never been sorry. They are real workhorses.

[Mark_89]

Thank you CapSizer. You have been very satisfactory :-)