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Discussion on Article:
Six Cores for a Desktop: Intel Core i7-980X Extreme Edition CPU Review
The increase in cores and clock make this a nice upgrade.
Enough to last till next year.
Everyday usage is needed to really notice the difference.
So this review is understandable...but incorrect.
How do you calculate the Uncore Frequency of Bloomfield ?
Bloomfields Uncore clock is always 2xDDR3 clock, thus if you use DDR3-1600 you'll get 3.2 GHz Uncore clock.
However, this is already overclocking, because Intel does qualify Bloomfield only with DDR3 up to DDR3-1066, not even DDR3-1333 is allowed.
Now it seems that the multiplier for Gulftown is lowered to 1.66, but maybe this is just an automatic setting. Check the uncore clocks with DDR3-1066, if you want to verify.
In contrast, at 4.2GHz my 980x consistently achieves about 90-92 Gflops using the popular "Intel Burn Test" version of Linpack, and using intel's own batchfile driven Linpack. Reasonably close to the max theoretical of 4.2 x 4 x 6 = 101 Gflops.
I have noticed my system showing unpredictable and low Gflop figures (anywhere between 50-something to 80-something Gflops) when something is unstable (yet stable enough for Linpack to finish 10 or 20 runs of a large problem size) and the CPU voltages are insufficient. I wonder if this is some error correction mechanism in the QPI interface which "thottles" the lanes when it detects errors. With enough voltage the Gflop numbers stabilize.
Would love to hear your comments on this.
please could someone tell me what is the difference in latency given in number of clock cycle vs in nanoseconds? is there a relationship between them?
example here L3 latency is 44 clocks and in lavalys 4.8ns
Also, I knew that the L1 cache latency is 0ws (wait state) so why here it is 1.2ns?
thank you very much
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