geofelt :
What you bought was 4 more threads, but no significant increase in single thread performance.
Still, the i7-870 is marginally faster in single thread performance, so the difference in performance cause is likely elsewhere.
Did you have an overclock on the i3-540?
If you did, you lost it with the clear cmos.
I would be inclined to continue with the i7-870 unless your gaming is negatively impacted.
What are the rest of your specs?
There was no overclock, my motherboard doesn't allow overclocking and for the bios update, they give no bios updates.
Motherboard - Zebronics z55
Ram - 8gb ddr3
GPU - Sapphire R7 240 V2 1G GDDR5
HDD - Toshiba 1TB 7200rpm
And yes it's a clean install windows.
WildCard999 :
Try updating the BIOS, if it still continues to be slow then you may want to consider a clean install of Windows.
Gaming performance should be a bit better with that i7.
https://cpu.userbenchmark.com/Compare/Intel-Core-i7-870-vs-Intel-Core-i3-540/m961vsm2936
That's what the benchmarks say but in fact it's not the truth. It's a clean install windows. Recently I saw a guy having similar issue, the thread was a few years old and they were discussing about the architecture of both the processors which were making the performance change. Now I really don't know if it affects that.
But according to benchmarks, it should improve the performance.
And about the turbo of i7, it never jumps to 3.6ghz, stays at 2.93ghz, dunno why.