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PC performs bad after new MOBO, CPU and RAM - should I reinstall windows?

Hi. I recently upgraded my CPU, RAM and MOBO, i now have:
New Mobo: ASUS Z170-A
New CPU: Intel i7 6700k (with Corsair H110i 280mm water cooler)
New RAM: HyperX savage DDR4 4x4Gb 2666Mhz

(From before: nVidia Geforce GTX 1080 FE, Samsung 850 EVO SSD, Windows 10 pro)

So as you can see this PC should perform exceptionally well. But instead I get considerable lower frames on the games now (e.g 50% FPS decrease in Witcher 3), and the PC seems overall slow and laggy. When I run benchmarks I also get low scores. Userbench confirmes that my PC performs way less than expected, with all components getting bad scores - http://www.userbenchmark.com/UserRun/1872048.
Also on Passmark i get low scores, especially the CPU and SSD.

I have tried everything, believe me, EVERYTHING, but nothing seems to help. I have reset and reinstalled all settings and drivers, updated BIOS, pc- and registry cleanup, virus- and malware scans, even reapplied thermal paste several times.... you name it. So the only thing left is reinstalling windows. Maybe I should have done that from start, but since it booted and seemed good to begin with I didn`t think much about that.

Since all components seem to perform bad I draw the conclusion that it must be something wrong with some general system like the MOBO, BIOS or Windows.

One a side note I should say that after updating to latest BIOS (2202) that`s when I really noticed the performance being bad, but I really didn`t run any benchmarks or such before that so I don`t really know for sure. So I also wonder if a BIOS update can do this? I mean shouldn`t new BIOS be better, like always?

What are you`re thoughts?
Thanks in advance!
4 answers Last reply Best Answer
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  1. Best answer
    So you changed motherboard, CPU and ram and didn't reinstall win 10? Its possible you missed a driver or that a fresh install generally runs better on a new PC.

    Not all BIOS updates add improvements, some just exist to add new features to support hardware you don't have.

    I would fresh install after backing up everything you can't afford to lose.
  2. I reinstalled and now everything runs perfectly. Damn what a difference from before. Got 99% percentile on Passmark now and 97% percentile on 3DMark11. OCed my CPU to 4,8Ghz and it`s so fast now!
    I probably should have understood from start that when you upgrade cpu, ram and mobo - which is essentially like getting a new computer - you need a fresh install of the OS. Well, atleast I learned quite a bit from this process and it ended happily.
  3. My last PC was 10 years old when I replaced it so the speed difference I got on this one just at stock was enough to not make me need to overclock CPU at all. I still haven't as I like it running cool over fast. When I got my 980 last year I ran all the tests and though I only have an I5 it still got similar scores to yourself and made me feel good about my purchase. I am old enough to know that it wouldn't last forever but its fast enough for me still

    Fresh install can make an old PC feel fast so I can imagine its pretty good right now.
  4. Colif said:
    So you changed motherboard, CPU and ram and didn't reinstall win 10? Its possible you missed a driver or that a fresh install generally runs better on a new PC.

    Not all BIOS updates add improvements, some just exist to add new features to support hardware you don't have.

    I would fresh install after backing up everything you can't afford to lose.


    By this do you mean fresh install without keeping any old settings, data or apps? I did a fresh install the other day to see if this would fix the issues and my pc still isn't getting the performance it should.
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