Diasha :
Hi.. My first post...

I want build PC from second processor. Which better betwen Xeon 5450 or Phenom ii x6 1090T.
I'll use this PC for graphich design such as corel draw, photoshop. inkscape and gimp when im using ubuntu OS.
I heard that graphic programs didnt use fully 6 core, is that right?
Thanks before
(sorry if my english bad

)
Diasha,
Most graphic design do not use more than one core, but some processes do- certain effects and especially CPU rendering use all possible CPU cores at 100%. CPU rendering has a much better quality for single images. For video processing, there are so many images- frames- that the processing is done by GPU- graphics card cores.
In Passmark CPU Ratings;
Xeon X5450 : CPU Mark =
4177 / Single Thread Mark =
1264
Phenom ii x6 1090T:
5639 /
1220
If those two are the only choices, I would choose the Xeon X5450 because the single thread performance is important in graphic design. Also, that series of Xeon is extremely reliable. Our office has a 2008 Dell Precision T5400 with two X5460's (4-core @ 3.16GHz). That computer has never had any kind of failure since purchase in 2010.
For graphic design, neither processor is especially good. The Xeon is not "hyperthreading". The Xeon has 4-cores and 4-threads but later Xeons have 4 cores /
8 threads. The hyperthreading fills in the idle processing time. This means that processor-orientated rendering will be much faster with hyperthreading. Also, those processors will be running on DDR2-667 RAM memory, very slow and runs very hot.
If you can, look for Xeons that use the LGA1366 socket. There are models that have 6-cores, those will have higher clock speeds- up to 3,86GHz, are hyperthreading, and can use DDR3-1333 RAM memory in larger quantity.
We have two LGA1366 systems in the office: Dell Precision T3500 and T5500. The T3500 has a Xeon X5677 (costs about US $50_ and that is 4-core /8 thread @ 3.5 /3.7Ghz with the Passmark numbers:
6984 /
1518. That system has 12GB of DDR3-1333 ECC (= error correcting). The T5500 has two Xeon x5680, 6-core @ 3.3/3.6GHz:
8767 /
1446 and with 48GB of DDR3-1333 ECC. The T5500 has a PERC H310 RAID controller (about $50) that makes the disk system run at the 6GB/s rating instead of 3GB/s. LGA1366 will have much better performance and not need to be changed as soon.
If you can buy a Dell Precision T3500 that would be the least expensive and easiest way to have a good system for your work. They have a very high quality of construction and are quiet. We paid only $53 for the T3500. That system was originally:
Precision T3500 (2011) (Original) Xeon W3530 4-core @ 2.8 /3.06GHz > 4GB (2X 2GB) DDR3-1333 ECC > GeForce 9800 GT (1GB)> WD Black 500GB
[Passmark system rating = 1963, CPU = 4482 / 2D= 609 / 3D=805 / Mem= 1409 / Disk=1048]
And the performance actually was usable as it was.
If you can buy a working system, you can put it to work right away and add better parts when you find them. That is much easier than building.
Cheers,
BambiBoom
HP z620_2 (2017) > Xeon E5-1680 v2 (8-core@ 4.1GHz) / 64GB DDR3-1866 ECC Reg / Quadro P2000 5GB / HP Z Turbo Drive M.2 256GB + Intel 730 480GB + Seagate Constellation ES.3 1TB / ASUS Essence STX PCIe sound card / 825W PSU / Windows 7 Prof.’l 64-bit > 2X Dell Ultrasharp U2715H (2560 X 1440)
[Passmark Rating = 6166 / CPU rating = 16934 / 2D = 820 / 3D= 8849 / Mem = 2991 / Disk = 13794] 4.24.17 Single Thread Mark = 2252