![]() Apple clocked its A4 and A5 CPU core(s) at 800MHz, although these Geekbench results point to a 25% increase in frequency at 1GHz. I suspect it's mostly the latter, although all microprocessor design is a constantly evaluated series of tradeoffs (often made through giant, awesomely protected spreadsheets). Update: The first iPhone 5 reviews are out and this Geekbench data looks accurate.Ĭache sizes haven't changed, which either tells us Apple isn't feeling as generous with die size as perhaps it once was or that working sets in iOS are still small enough to fit inside of a 1MB L2. The rest of this post is simply my initial thoughts on what these mean, should the results be accurate. I need to preface the rest of this post with a giant caution sign: I have no inside knowledge of whether or not these results are legitimate. They seem believable, but anything can happen. MacRumors appears to be first on the scene, having been tipped by an employee at PrimateLabs (the creators of Geekbench). Brian believes this is likely the A1429 Verizon device (A1428 being iPhone 5,1) - perhaps one presampled to a reviewer looking to test their luck. Remember that clock speed doesn't matter, but rather the combination of clock frequency and instructions executed per clock that define single threaded performance.Ī short while ago, Geekbench results for a device identifying itself as an iPhone5,2 appeared. Why does clock speed matter? Because, if reported accurately, it can tell us a lot about how the A6's CPU design has improved from an IPC standpoint. Geekbench is particularly useful because it reports clock speed. There's absolutely no chance of Apple sending us a nice block diagram of the A6 CPU cores, so we have to work with what clues we can get elsewhere. Apple opted not to design in a vanilla ARM Cortex A9 likely to avoid relying on pure voltage/frequency scaling to improve performance, and chose not to integrate a Cortex A15 likely because of power consumption concerns as well. Yesterday we confirmed that Apple is using its own custom designed ARM based CPU cores in its A6 SoC. This usually happens before every major smartphone launch, but in the case of the iPhone 5 the details these applications can give us are even more important. While working on our Haswell piece, I've been religiously checking the Geekbench and GLBenchmark results browsers to see if anyone ran either benchmark and decided to tap upload.
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