Core i7-3667U and the Core i7-3517U are low power ( 17 Watts TDP rating) and are favorite choice for ultra nootebook manufactures. Both are dual core processors and the i7-3667U is clocked 100 MHz higher than the i7-3517U ( 2.0 GHz Vs 1.9 GHz). This makes i7-3667U theoretically 5% faster than the i7-3517U.
Notice that the Turbo boost is more aggressively clocked in case of the i7-3667U (3.20 GHz Vs 2.80 GHz). You will not find any difference in these processors when doing normal routine work like email checking, surfing and document editing, but you may find the i7-3667U a little faster in computing related tasks including program compilation. Basically anything that takes more than a few second to complete will show improvement.
Both the processors come with the same HD Graphics 4000. The HD Graphics 4000 is close to 50% better than the HD Graphics 3000 ( The Sandy Bridge one).
Table : Core i7-3667U Vs Core i7-3517U Feature Differences
|Feature||Core i7-3667U||Core i7-3517U|
|Core Frequency||2.00 GHz||1.9 GHz|
|No. Of Cores||2/4 Hyperthreads||2/4 Hyperthreads|
|Cache Organization||3 MB L3||3 MB L3|
|Turbo Frequency||3.20 GHz||2.80 GHz|
|TDP Rating||17 Watts||17 Watts|
|64 Bit Support||Y||Y|
|Lithography||22 nm||22 nm|
|Integrated Memory Controller||DDR3-1600, DDR3L-1333||DDR3-1600, DDR3L-1333|
|Integrated Graphics||HD 4000, 350 MHz Base, 1150 MHz Turbo||HD 4000, 350 MHz Base, 1150 MHz Turbo|
Table : Core i7-3667U Vs Core i7-3517U Benchmarking Comparison
|Benchmarks||Core i7-3667U||Core i7-3517U|
|PassMark CPU Mark Score||3560||4091|
|Super Pi 2M (Lower in better)||Not available||32 seconds|
|3D Mark 06 CPU||Not available||3300|
|Windows 7 Experience Score||Not available||7|
Some more details of Core i7-3667U
The Core i7-3667U is a low power variant of the Ive Bridge processor. The 22 nm Lithography in Ivy Bridge has helped Intel to scale higher base and turbo clocks. The think and sleek notebooks are going to benefit in performance. An improved Integrated HD Graphics 4000 now gives performance close to many mid level discrete graphics
Some more details of Core i7-3517U
The Core i7-3517U is the low power variant of the Ive Bridge processor. The 1.90 GHz dual core is great for enry level tasks. A turbo clock of 2.80 GHz ensures that the performance does not suffer when you need them. The integrated graphics HD Graphics 4000 is 50% better than the earlier generation HD Graphics 3000 in Sandy Bridge. Most of the high performance ultrabooks come with this processor.