官方机啥样？看英特尔Nehalem-EX样机超详评测(1)(32)

CineBench R11.5 64bit
处理器	双路Intel Westmere-EP Xeon X5680	DELL PowerEdge M910 四路Intel Nehalem-EX Xeon E7540	四路Intel Nehalem-EX Xeon X7560 超线程关闭	四路Intel Nehalem-EX Xeon X7560
显卡	-	-	-	-
CPU Benchmark
Rendering (1 CPU)	1.16 pts	0.78 pts	0.92 pts	0.92 pts
Rendering (x CPU)	16.40 pts	19.26 pts	15.70 pts	27.08 pts
Threads	24	48	32	64
Multiprocessor Speedup	14.18x	24.65x	17.14x	29.43x

CineBench受超线程影响很大，降低了42%的性能。

MMM - Matrix-Matrix Multiplicaion Benchmark
处理器	双路Intel Westmere-EP Xeon X5680	DELL PowerEdge M910 四路Intel Nehalem-EX Xeon E7540	四路Intel Nehalem-EX Xeon X7560 超线程关闭	四路Intel Nehalem-EX Xeon X7560
单位	GFLOPS	GFLOPS	GFLOPS	GFLOPS
Threads 1
5000 step	8.877563	5.867645	6.965506	7.036748
10000 step	8.883291	5.865347	6.974666	7.034792
15000 step	8.881528	5.826604	6.935187	6.960592
Threads 2
5000 step	17.5891	11.570261	13.944669	13.979099
10000 step	17.73566	11.689317	13.984364	14.032266
15000 step	17.67208	11.602247	13.920488	13.89951
Threads 4
5000 step	34.85343	21.788607	27.715225	27.555005
10000 step	34.90105	22.21115	27.846714	27.685804
15000 step	34.92557	22.073702	27.702342	27.297404
Threads 8
5000 step	45.99856	41.228878	49.714209	49.518835
10000 step	45.99856	43.472432	50.227199	49.767277
15000 step	47.74417	43.37777	50.514463	49.750117
Threads 16
5000 step	66.10022	73.379889	96.880558	47.855051
10000 step	72.38159	78.596851	99.776303	48.320744
15000 step	73.2495	79.099092	99.385572	48.421492
Threads 24
5000 step	66.10022	94.000418	138.717733	70.233111
10000 step	72.38159	124.028823	148.818098	71.502532
15000 step	73.2495	124.574801	148.054922	71.685326
Threads 32
5000 step			151.664487	96.076302
10000 step			184.741778	97.64478
15000 step			183.894563	98.195937
Threads 48
5000 step		97.335138		136.623189
10000 step		119.780984		142.50301
15000 step		121.637469		145.534244
Threads 64
5000 step				137.141474
10000 step				182.49902
15000 step				185.098571

打开关闭的峰值计算性能都差不多，表明了这些程序对运算单元的利用率高，超线程起到的作用不太大。

SunGard Adaptiv Analytics Benchmark v4.0
处理器	双路Intel Westmere-EP Xeon X5680	DELL PowerEdge M910 四路Intel Nehalem-EX Xeon E7540	四路Intel Nehalem-EX Xeon X7560 超线程关闭	四路Intel Nehalem-EX Xeon X7560
Threads	24	48	32	64
Time (lower is better)	94.911s	139.512s	66.986s	104.925s

这个程序本身就推荐关闭超线程运行。

black_scholes
处理器	双路Intel Westmere-EP Xeon X5680	DELL PowerEdge M910 四路Intel Nehalem-EX Xeon E7540	四路Intel Nehalem-EX Xeon X7560 超线程关闭	四路Intel Nehalem-EX Xeon X7560
Threads	24	48	32	64
Time (lower is better)	5.51s	4.40s	3.21s	2.78s

这个程序可以有效地利用多线程。