They might be very silly questions but after googling a lot I do not find answer of below issues: With respect to speed what is better under two alternatives out of first is having 1 TB hard disk of 7200 RPM 64 Mb Cash and second two hard disk each of 500GB 7200 RPM 32MB Cash [No RAID]. If processor speed is 3. GHz and RAM is DDR3 1333MHZ. In such case RAM Speed is 2666 MHZ as it is DDR. Now at what speed the processor would work at 3 GHZ or at 2.666 GHZ. Will DDR3 1600 will change the performance. If Board Supports 32GB Ram but installed only 8GB then will it reduced performance of processor or other onboard component / video or graphics performance. SMPS is 450 watts. Is it the peak capacity of the power or it would consumed 450 watt irrespective of what components connected to it. Will It consume more power if two hard disk connected in compare to a single hard disk. In case of windows8.1 when reset with option to delete all personal setting and data then MAC of the onboard LAN card was changed. Is there something wrong? Whole system checked via antivirus and other anti malware programs but nothing found. Thanks for your valuable time.