Join Date:Joined: Jul 2006
This is L1 cache that matters to chess... not Ghz
Let me contribute to that topic with some more precision.
If you are looking for more Nodes per second, the decisive criteria is the L1 CACHE of the CPU. It plays much more on the outcome compared to the frequency. I am quite sure about that after trying this test on different Snapdragons.
Snapdragons have 16K data + 16K instruction cache. Therefore, even a Galaxy Note IV can barely reach 700K despite 2.65Ghz speed of the Snapdragon 805, while its Exynos brother boosts no less than 1400K.
You may recall the Exynos is octa-core. and SD805 is only 4 cores. If we are supposed to think that's the reason, come explain 730K made with the Exynos 4412 of Galaxy Note 2 which runs @ 1.6 x 4 cores.
Exynos CPU's have 32K+32K L1 cache! That's why they perform surprisingly better. But be careful with all this big.LITTLE thing which is extremely mind confusing. I did not test a note III or a Galaxy Tab with Exynos 4+4 cpu's. They all have low freq set of cores which, if used, could seriously reduce the speed. But i guess engines like Stockfish will force the hi-freq cores. In Note-III case, that means 1.9 Ghz x 4 cores.
The L1-cache effect is obvious on Apple CPU's which have 1.3Ghz x 4 cores but 64K cache. They perform easily around 1300K.
Finally, stay away from Snapdragons if you use Droidfish and check for octa cores, capable of working together at peak speed and insist on 32K+32K L1 cache minimum per core !!!
Alternatively Mediatek octa core CPU's have 8 cores working in parallel at speeds up to 2.0Ghz. They should give 1200 Knps. MTK6592 for example is a concrete low-cost potential. Give it a try if you can. Mediatek will soon release stronger CPU's but they will be big.LITTLE too, unfortunately...
All i say above applies to chess only. Real life usage, internet, movies, games, social media etc is totally a different world and Snapdragon 805 is a monster there! Qualcomm does not and should not focus on delivering the best chess CPU for mobiles., for us, freaks and they are right in what they are doing for mass users market.
Last edited by g3k; 21st November 2014 at 01:34 AM.