Originally Posted by shanedennis
Gotta say, this is why I like CF. Put a thought or idea out there and you get great feedback and discussion that is relevant to cruisers.
At first glance, it would seem so. But if you do some fact checking, you find out that Haswell is not really an improvement in power consumption vs current
For example, I just bought a Toshiba Satellite
17.3" S-70A series laptop, custom built for performance. It uses an Intel I7 4700MQ with Haswell architecture (currently the 3rd fastest mobile CPU on the market, 2.4GHz/3.4GHz Turbo behind 4800MQ @ 2.7GHz/3.7GHz and 4900MQ at 2.8GHz/3.8GHz) with a TDP of only 47watts.
However, according to Wikipedia, Haswell is only 6% faster in multi threaded performance over Ivy Bridge, 3% faster overall, but consumes 8% more
power and 15* C hotter.
Compared to Ivy Bridge:
Approximately 8% better vector processing performance.
Up to 6% faster single-threaded performance.
6% faster multi-threaded performance.
Haswell draws around 8% more power under load than Ivy Bridge.
Around 15 °C hotter than Ivy Bridge and unable to break 4.2 GHz easily.
A 6% increase in sequential CPU performance (eight execution ports per core versus six).
Up to 20% performance increase over the integrated HD4000 GPU (Haswell HD4600 vs Ivy Bridge's built-in Intel HD4000).
Total performance improvement on average is about 3%.
I selected this cpu/model for it's price/performance ratio, but with an eye toward cpu efficiency, especially when they throttle down to just a few watts for most tasks, like email
or writing. Currently I'm burning the laptop in with Folding@Home which keeps the CPU @ 100% load 24/7 while folding protein simulations for Stanford.
Along with 8GB RAM and a DVD
burner, I replaced the 750GB HDD with a 500GB Samsung 840 series SSD drive, which radically increases overall system speed and responsiveness, while helping to lower power consumption and replacing a spinning platter with a more reliable SSD.
This laptop is the new replacement for my slightly slower 15.6" laptop with i5-2430M (2.4GHz/3.0GHz) with 8GB ram and 256GB SSD. It still feels very fast, only slightly slower than the i7 in most applications, thanks to the SSD.
So for those wanting speed, efficiency and low power
consumption, one could buy an Ivy Bridge i7 laptop with a 3630QM or 3635QM processor with a TDP of 45 watts, less heat, and much lower price
since it's last year's CPU, yet it's virtually as fast (clock for clock) as much more expensive newer CPUs.
Anyhow, I learned a long time ago in the Navy
, "trust, but verify."
As we used to say on the ESM stack, "In God we trust, all others we track!"