nbench (64-bit/32-bit/source) is a great free Linux benchmarking tool for basic processor comparisons on Linux. Despite its utility, nbench is not a popular tool among reviewers and tech bloggers. Therefore, here is a list of processors I have benchmarked with nbench, for myself and others to reference. In the future, rather than making new posts, I will add to this over time as I benchmark more systems.

Sorted by sum of Integer and Float scores multiplied by the number of cores. Note that on the calculated columns, a 30% increase in score is given to HyperThreading-enabled processors to account for the theoretical benefit.

CPU
MHz
Turbo
HT
L2 Cache
TDP(W)
Cores
OS
C compiler
libc
Memory
Integer
Floating
(I+F)*C
(I+F)/MHz
((I+F)*C)/W
Notes
Xeon E3-1265L2400330018192KB454Linux 4.4.0-109-genericgcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.1) libc-2.23.so42.86937.76258.867502.47080.0523407083311.16601778
Core i5-65003200360006144 KB654Linux 4.4.0-31-genericgcc version 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.1)libc-2.23.so66.08646.95472.493477.7880.03732718757.350584615
Core i7-7500U2700350014096 KB152Linux 4.4.0-31-genericgcc version 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.1)libc-2.23.so64.02145.45269.81299.68120.0554965185219.97874667HP 15-ay196nr
Core i3-3220330013072 KB552Linux 3.2.0-23-genericgcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)libc-2.15.so45.01238.65759.466255.11980.038654515154.638541818
Core i5-4300U1900290013072 KB152Linux 4.4.0-31-genericgcc version 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.1)libc-2.23.so43.7737.18160.49253.94460.0668275263216.92964HP Elitebook Revolve 810 G2
Core i5-32102500310013072 KB352Linux 3.2.0-23-genericgcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)libc-2.15.so42.15536.24255.685239.01020.047802046.828862857
Pentium G3240310003072 KB532Linux 4.4.0-116-genericgcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.1) libc-2.23.so41.06439.57764.757208.6680.033656129033.937132075
Celeron N29301830216011024 KB7.54Linux 4.4.0-47-genericgcc version 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.1) libc-2.23.so20.41915.55920.098185.41640.0253301092924.72218667
Celeron J19002000241001024 KB104Linux 3.13.0-24-genericgcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) libc-2.19.so22.29118.12321.677159.20.019915.92Acer Aspire X 603G
Pentium G620260003072 KB652Linux 3.2.0-23-genericgcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)libc-2.15.so33.26928.14644.221144.7340.027833461542.226676923
Atom Z37401333186601024 KB24Linux 3.13.0-24-genericgcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)libc-2.19.so17.20713.99416.753122.9880.023066016561.494Asus Transformer T100TA
Core i3 330M213313072 KB352Linux 3.0.0-12-genericgcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)libc-2.13.so25.15815.43630.686119.91720.028109985943.426205714
Celeron 1037U180002048 KB172Linux 4.4.0-31-genericgcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1) libc-2.23.so24.08322.03333.762111.590.030997222226.564117647
Celeron 1037U180002048 KB172Linux 4.1.12-gentoogcc version 4.9.3 (Gentoo)glibc-2.21-r122.15518.7429.83497.1480.026985555565.714588235
Core 2 Duo T5900220002048 KB352Linux 3.0.0-12-genericgcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)libc-2.13.so22.64217.0529.28292.6640.021062.647542857
Celeron J1800240001024 KB102Linux 4.4.0-47-genericgcc version 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.1) libc-2.23.so24.34918.55723.97585.0640.017721666678.5064ECS BAT-I(1.2)/J1800
Qualcomm MSM89391459004gcc 4.9.0 (ARM64)Andrioid Bionic10.910.5669.93582.0040.01405140507ASUS Zenfone 2 (*The CPU is advertised as 8-core, but only 4 can be active at a time)
MediaTek MT6589M120004Linux 3.4.5gcc 4.6.0 (-march=armv7-a)Android Bionic6.3127.4436.97357.6640.01201333333Alcatel/T-Mobile Fierce
Opteron 250240001024 KB891Linux 3.11.0-12-genericgcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8)libc-2.17.so17.21423.86523.82247.6870.019869583330.5358089888
Athlon 64 3200+200001024 KB891Linux 2.6.28-hardened-r9x86_64-pc-linux-gnu-gcc14.0213.721.0134.710.0173550.39
AMD C-60*10000512 KB92Linux 3.0.0-12-genericgcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)libc-2.13.so5.966.3819.96132.6840.0163423.631555556* Turbo-Boost not active
Pentium M160002048 KB24.51Linux 3.11.0-12-genericgcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8)libc-2.17.so9.90611.79814.5126.3080.01644251.073795918
Celeron (Northwood)26000128 KB62.61Linux 3.10.35-std420-i586gcc version 4.4.7 (Gentoo 4.4.7 p1.2, pie-0.4.5)libc-2.15.so11.9828.46516.03824.5030.0094242307690.3914217252
Atom N28016671512 KB2.51Linux 3.0.0-12-genericgcc version 4.6.1 (Ubuntu 4.6.1-9ubuntu3)libc-2.13.so9.8518.4667.55420.8260.012493101388.3304
Atom N28016671512 KB2.51Linux 2.6.31-14-genericgcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu8)libc-2.10.1.so8.037.917.4119.9160.011947210567.9664
Athlon (Thunderbird)11000256 KB601Linux 2.6.34-gentoo-r1gcc version 4.4.3 (Gentoo 4.4.3-r2 p1.2)libc-2.11.2.so7.3848.00611.78519.7910.017991818180.32985
ARM Cortex A8120001Linux 3.0.8gcc 4.6.0Andrioid Bionic3.4575.5371.7057.2420.006035
ARM v7 Rev2 v7180001Linux 2.6.29-omap1gcc 4.6.0 (-march=armv5te)Andrioid Bionic2.3933.2910.6273.9180.0048975Rooted B&N Nook Simple Touch 1.2.1
ARM v6 Rev5 v6160001Linux 2.6.35.7-perfgcc 4.6.0 (-march=armv5te)Andrioid Bionic1.0461.7640.2281.9920.00332T-Mobile Prism

These stats are as reported by nbench. Errors such as misreported 0 L2 cache on ARM chips are copied over, verbatim. 

You can check out a more comprehensive list of results from Mr. Uwe F. Mayer’s website, who hosts the source code of his Linux port of nbench.