Let's say that we have a set workload doing a set amount of work.
If I have two identical servers, one equipped with a E5-2660 and one with a E5-2670 and otherwise identical hardware, will the total amount of power consumed by the system while processing this workload (regarded as work units/second, not a total amount of work to be done) differ?
If we compare these very similar processors we see the following differences:
E5-2660: Clock speed 2.2/3GHz, TDP 95W
E5-2670: Clock speed 2.6/3.3GHz, TDP 115W
It certainly makes sense that we can load up the E5-2670 with more load and it will thus have a higher TDP, but if we're only loading it up to:
- 1000 transactions/second (arbitrary workload value mentioned above)
- 100% of the capacity of a E5-2660
then what should I expect the actual wattage draw of the system to be (when compared with the E5-2660 system)?
- E5-2660: 2201000 2200000 2100000 2000000 1900000 1800000 1700000 1600000 1500000 1400000 1300000 1200000
- E5-2670: 2601000 2600000 2500000 2400000 2300000 2200000 2100000 2000000 1900000 1800000 1700000 1600000 1500000 1400000 1300000 1200000
- E5-2660: Multiplier 99.96MHz
Maximum turbo limit with 1/2/3/4/5/6 cores active is 30/30/29/29/28/28
- E5-2670: Multiplier 99.73MHz
Maximum turbo limit with 1/2/3/4/5/6 cores active is 33/33/32/32/31/31
Running idle with the
performance profile and the
ondemand governor means both types of processor (on RHEL6) clock down to 1.2MHz and spend 50% of their time in C1.