Everything same but there is huge performance difference

[Squirrel IT]

recently i found some issues in remade sff Dell and hp i7 6th gen cpu
explanation and troubleshoot 
 

i test on two 100% same system for both dell and hp sff system with new thermal paste and clean both pc from dust
same driver and hardware version and configuration

but both are performance having more then 20% diffidence 

 

troubleshooting

clean install windows on ssd
no hdd

try different ram

try different ssd manufacturer

 

one pc works batter with any of above scenario another one works fine for some days and then need to clean install windows again for performance

i try dism and sfc  but no fix without installing windows again

both pc are using for same purpose and same environment

 

 

is it possible that processor or motherboard can be bad one?

i can not find any solution
can some one help me here plz!

[RONOTHAN##]

32 minutes ago, Squirrel IT said:

but both are performance having more then 20% diffidence 

Which one is performing worse? HP systems are pretty well known for having issues with power throttling, so it might be that it's hitting power limits in the BIOS or the VRM is overheating. You might be able to verify through measuring some sensors with HWiNFO64.

[mariushm]

I agree, most likely the VRM of the less performing system is undersized or not cooled properly or the bios is very conservative and locks the CPU to a maximum power budget, while the other system may allow it to burst above the power budget for very short time periods. 

 

You can test to see if it's overheating by having a fan blow air over the VRM area (usually on motherboards between the IO shield with connectors and the CPU socket, but on SFF may be different... a bunch of chips in a line with some capacitors and inductors near it, close to the cpu socket)