Z820 - Performance Issue

Dears,
I have a Z820 16GB ( Xeon processor ) and a Dell Precision M4500 8GB ( i7 CPU @ 2.13 GHz ), in both , the operating system is Window 7 64-bit ,
Office 10 is installed in both
While working on Excel files, i have experienced very low performance of Z820 when compared to the Dell M4500
In M4500 , i could open 4 huge excel files ( 55MB each ) and work on them simultaneously with no any problem , no interruption and no ( Not responding message ) , while in the Z820 , i had to force closing the files in many occasions due to ( not responding message in some cases or because the screen turned into black and flashes.
I had done some test as following:
Opened the same excel file in both workstations, typed my excel formulas that spread into 14 columns and run them down to 500,000 rows, the M4500 finished in 22 seconds , while the Z820 at the first time stopped with the ( Not responding message ) but in the second test it could finish the same function in 8 minutes.
I can share with you the formulas taht i used in excel if that helps.
I am really surprised because the spics of Z820 is much more greater than the spics of M4500
Could you please advise me what to do and where to start to resolve this problem?

Hi:
I recommend you also post your question on the HP Business Support Forum - z Workstations section.
http://h30499.www3.hp.com/t5/Workstations-z-series-xw-series/bd-p/bsc-272#.Ur3RXel3u9I

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Dear Friends, I would like to know
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That HP Z820 should kick the Mac pros butt! For example we run Autodesk Flame systems ( 150k software) on the Z820's with Quadro 6000 cards and they fly. We also had a new mac pro in for testing a few months ago w the dual fire pro cards all decked out and it was crap next the the Z820. Of cource the new MP cant run allot of highend software because of its lack of nvidia support and the firepros lack of open GL but we did run premier and smoke etc on it for testing. ( Although i thought it looked cool the total lack of exandability and nvida support was to much so we sent it back). Graphic workstations need PCIe expandability and a choice in GPs.
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-Software being used will dertermine the hardware purchased,
-The dual xeons at the much lower clock speed are meant to work 24/7 like a lamans endurance race, not a sprint race. Better to get highest frequency xeons.
-Having dual CPUs with all thoughs cores will only work with a software that is properly mulithreaded, premier is definetly not one of those softwares so you not getting any advantage.
- the advantage to Quadro cards are much more noticable in 3d tha 2d. If your running Autodesk maya, 3ds max or the recently disscontinued XSI you would be flying compared to the W7000.
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-At present ( and as akways) , nividia Quadro drivers are much more uptodate and bug free compared to ATI highend cards. This will inevitably change as openCL over takes openGL, until then Quadros are the clearly superior cards for those with DEEP pockets.
-I think you would have been far better off with a single Quadro 6000 vs dual K4000s. Also any higher end ATI firepro card would have worked since Premier now uses open CL and no longer needs openGL. Main advantage to Quadro at this point ( besides 3D ) is to be compatible with the most softwares and get the best and most optimized drivers. Firepros will work properly in far fewer softwares at this point but I can see a day over the next few years this may change but not as of yet in 2014. So his W7000 wins this sprint race in this single simple example but in most any other situations your cards will actually work and win. I like saving money like the next guy but I even purchase Quadro cards for my home use and experimenting, but Im not a gamer.
-FYI: Cuda core count no longer is true measure. For example older Fermi cards worked at twice the frequency than the newer kepler architecture so in effect today you need double ( actually more) the amount of cuda cores to equal the older cards. Also the true compute power in the new Keplers is also much inferior to the older cards. Its all creative advertiseing today more akin to creative accounting / smoke and mirrors. What im trying to explain is when people read the charts that show the cuda core count and say the higest is best is completely not true. It may have the most "cores" but it will not render correctly, double percision is missing, colors may pop, anti aliasing is inferior and inconsistant, interaction ( most important) and shaders will be buggy or missing. There are very good reasons people spend money on highend Quadro cards but the charts and reviews generically speaking never understand or can even test for this stuff.
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I am CLEARLY not a tech guy as my talent in is creation and design but I overhear the tech guys talking.

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