AMD Phenom II X4 975BE and 840 CPU Reviews

wPrime

wPrime is a leading multithreaded benchmark for x86 processors that tests your processor performance by calculating square roots with a recursive call of Newton’s method for estimating functions, with f(x)=x2-k, where k is the number we’re sqrting, until Sgn(f(x)/f'(x)) does not equal that of the previous iteration, starting with an estimation of k/2. It then uses an iterative calling of the estimation method a set amount of times to increase the accuracy of the results. It then confirms that n(k)2=k to ensure the calculation was correct. It repeats this for all numbers from 1 to the requested maximum.

Benchmark Results: Unlike the memory bandwidth, the Phenom II X4 975 BE is not able to keep up with the Phenom II X6 1090T hex-core in this raw CPU calculating benchmark. What is nice to see is the X4 840 performing just a tad slower than the Intel Core i5 2400 and the X4 975 BE performing on par with the Intel Core i5 2500K!