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So I work at a company as an IT guy while I am doing my computer engineering degree. Doing hardware and software maintenance of computers is part of my job. I have had a weird experience with two of the computers. These two computers(one desktop one laptop) were the slowest computers in the company. The laptop is Dell Inspiron N5010 with i3 370M(2 cores, 4 threads) processor. The desktop is HP 500B MT with E5800(2 cores 2 threads) processor.

At first, both of these computers had windows 7 running on them. CPU-Z(1.87.0) benchmark of the desktop was 113(single thread), 227(multithread). The laptop was 82, 267.

After I formatted these computers with windows 10 and ran the same CPU-Z version benchmark, I got exactly double performance with both computers. Both single threading and multithreading scores got doubled.

After formatting with windows 10, desktop got 270, 510. Laptop got 180, 520.

What is causing this? Physical core number stayed the same. Logical core number stayed the same. I am baffled.

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    Welcome to Superuser! Did you do the benchmark in the exact same conditions? I mean, a newly formatted PC is always better than with all those programs running. I don't see much of a point on this question but..
    – CaldeiraG
    Apr 2, 2019 at 14:33
  • By format them with Windows 10, do you mean completely reformatted the hard drive and started with a clean slate? Or did you just upgrade the OS and leave the programs/files all the same?
    – DrZoo
    Apr 2, 2019 at 14:34
  • @DrZoo Completely reformatted the hard drive.
    – Michael
    Apr 2, 2019 at 14:40
  • @TiagoCaldeira Before formatting the desktop computer to windows 10, i formatted that same desktop to windows 7(because it had problems). And i didnt see the cpu benchmark change. When i formatted again with windows 10 i saw the cpu benchmark score double.
    – Michael
    Apr 2, 2019 at 14:41

2 Answers 2

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Is it possible that you upgraded from 32 bit Windows 7 to 64 bit Windows 10? According to this FAQ under the point What algorithm does the benchmark use... they state that

the 32-bit version keeps using the legacy x87 instructions, resulting in almost half of the x64 performance

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Perhaps your Windows 10 image has a better driver selection than the Windows 7 install source you used.

Also, were all installs fully patched?

Update: The only real way to tell now would be to do a clean install from Windows 7 installation media (i.e. a DVD or USB), make sure its fully updated and run again. Otherwise perhaps be happy you now have better performance :)

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  • I downloaded windows 10 home from website of windows. When it comes to windows 7, i used settings->Update & Security->Reset this PC
    – Michael
    Apr 2, 2019 at 15:20
  • "Reset this PC" may have set it back with an image before various service packs and updates (interestingly I thought that was the the terminology post-windows 7 but hey-ho)
    – gjpio
    Apr 2, 2019 at 15:43
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    Windows 7 does not have a "Reset this PC" feature.
    – Ramhound
    Apr 2, 2019 at 20:30

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