According to Bare Feats, http://www.barefeats.com/rmbp15c.html, the fastest 2015 13" MBP matches the fastest 2015 15" MBP in the single core CPU test. How can this be when the turbo boost is 4.0GHz vs 3.4Ghz?
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Fastest 13" matches fastest 15"
- Thread starter lankox
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Turbo Boost is essentialy overclocking the CPU when only one (or even two in quadcores) core is used heavily. Turbo Boost is there to make those short and intensive bursts of CPU intensive workload faster. When TB is active, your CPU transforms a lot of electricity into heat just like any overclocked CPU would, and after a while it becomes more of a cooling problem than a performance problem. So maybe the quad core in 15" produces a tiny bit more heat per cycle or the cooling on the 13" is a bit more effective, or the quad's architecture is optimized more towards parallel computing and its single core performance is a bit worse.
It is very possible that the Single Core test could be the same as that 15in MBP, the reason being 15in Uses Haswell and 13in was able to get the newer Broadwell chip since Intel released the U series earlier in the year, so its a "more advanced" chip. Having said that, its only two core. So you match that up with even the lowest of the 15in's CPU's and it will blow it out of the water. Its literally twice as powerful for CPU operations. This day in age most applications are now utilizing multiple cores, and older apps that may only use a single core are not going to gain much at this point anyway. Always look at the multi core score, its more accurate for todays application performance.
Yep if your software is only using one core and you are only running one app the 13 will match the 15, howeverthat is a very limited use case and the 15 inch will spank the 13 inch all over the place in almost any multi core app.