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-   -   Advice needed: Buying a PC (http://www.cfd-online.com/Forums/hardware/71020-advice-needed-buying-pc.html)

fateme December 12, 2009 08:47

Advice needed: Buying a PC
 
Dear All

I am planning to buy a new PC. I am currently writing my own NS Fortran code (3D & structured). I think at the most I would need about 500*200*50 grids, which would probably need about 1GB meomory. But the problem is that the simulation time is very large, so I would need as much speed as I can get.

I would very much appreciate your help about these questions:

1. Does any one have experience with AMD cpus? Are they better than Intel or not?

2. What about CORSAIR 1600 (-Dominator) Ram? It's price is about $100 higher than CORSAIR 1333. Does it influence the efficiency of the PC or not?

3. Which one is better? "Intel Core 2 Duo E8400 - 3.0GHz " or "Intel Core 2 Quad Q9550 - 2.83GHz"
The first one has 6MB cache and the second 12MB. Do you think the Q9550 is worth the price?

Thanks in advance

bramv101 December 14, 2009 10:59

1. at the moment I would stay away from consumer AMS CPU's, for high end CPU's its another case
2. Every aspect of your I/O will influence your final speed. RAM, harddrive, bus speed etc... all influence your performance. SO dont ruin a perfect system with a slow 5400RPM diskdrive
3.Only go for multicore CPU's when you can solve in parallel (there is no other benefit to this)

lowest system specs: go for a fast intel i5 quad, 4Gb RAM, 12k hard drive and DDR3 1600Mhz

mid-end:xeon 5500 series or i7, solid state HDD, 8Gb RAM, 64bit OS, DDR3 1600+

fateme December 14, 2009 14:09

Thanks for the help Bram.

Could you please help me with these questions too?

1.What do you mean by I/O? Does it mean input/output?
2. Is the performance of the i7 cpus much better than the Intel core2 quads?
3. Does having a 64 bit OS or a 32bit make a difference? Is the 64 faster?

rwryne December 14, 2009 14:36

Quote:

Originally Posted by fateme (Post 239975)
Thanks for the help Bram.

Could you please help me with these questions too?

1.What do you mean by I/O? Does it mean input/output?
2. Is the performance of the i7 cpus much better than the Intel core2 quads?
3. Does having a 64 bit OS or a 32bit make a difference? Is the 64 faster?


1. yes he means input/output. He is basically saying the chain is only as strong as the weakest link (computer is only as fast as slowest component!)

2. yes, i7s are faster than core2quads. I imagine if you go to a website such as Tom's Hardware you can find lots of benchmark test comparisons

3. It certainly matters if you plan on using more than 3.5 gigs of memory (32-bit operating systems** have a ~3.5 gb limit)

that is where the speed difference between 32-bit/64-bit comes from

** from my understanding, you can apply changes to the linux kernel to "fix" this. I have never really looked into this though


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