So I still had the original P9X79 Deluxe Motherboard (Motherboard A
) and decided to compare it to the P9X79 Deluxe I exchanged it for (Motherboard B
). That would give me a good point of reference since they are the exact same Motherboard.
Well, here's where things get interesting...
I used the EXACT same settings for both Motherboards (Loaded Optimized Defaults, set CPU Strap to 125, set RAM manually to 1333 Mhz with Auto Timings, set Core Voltage manually to 1.37, all else left on default AUTO):
The original Motherboard (Motherboard A
) passed Prime95 in over 8 hours:
The newer Motherboard (Motherboard B
) failed Prime95 in under 3 hours:
You would think Motherboard B is faulty since it failed where Motherboard A passed, right?
Well, not so fast! If you look at the screenshots closely, you will notice that the Core Voltage in Motherboard A ranged from 1.38v to 1.41v
(remember, it was set manually to 1.37), yet the Core Voltage in Motherboard B ranged from 1.37v to 1.39v
So it would seem that the only reason Motherboard A
passed Prime95 is because it gave the CPU a lot more juice. In other words, it seems like it "cheated"!
In fact, in previous testing, Motherboard B
had passed Prime95 with a Core Voltage of 1.38v which happened to give the CPU the EXACT same range (1.38 - 1.41) Motherboard A
gave it at 1.37v.
1) Is it normal for a Motherboard to provide a Core Voltage from a minimum of 1.38 to a maximum of 1.41 when it is manually set to 1.37?
2) How can two Motherboards of the exact same brand and model perform so differently?
3) Which of the 2 Motherboards should I keep? (Or should I get a 3rd one because they're both stuffed?)