Bios not reading fan speed

With my new arctic cooler copper silent 2tc install the bios doesn't read the fan speed until the system under load.
When it's under load the system seems ok but when I and just doing a bit of web surfing I'm getting BSOD's (processor.sys error) and freezing.
is this related to the fan speed not being detected can this cause problems?

Quote
Originally posted by Wonkanoby
Rated Fan Speed:   1400 - 2800 RPM
Power Consumption:   12 V, 0.18 Amp.
Air Flow:   14-36 CFM
Weight:   395 g
Noise Level:   12 - 24 dB
Thermal Resistance:   0.29 °C / Watt
many motherboard have a problem detecting a fan spinning under 2000 rpm
sounds like its letting it get to hot at idle
what are your temps
when it goes wrong it's normally in the 30's and then I reboot and watch it in bios stays high 30's or early 40's
when running prime in heat mode it's never got above 54c which was just peak not a constant.
When I was running prime in heat mode the system seemed quite stable and fan was showing around 1600 - 1800 rpm

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