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I5 3570k or 3770k

If you have the money 3770K its the better CPU, as for FSX i don't know what thread usage it gets but as the IPC of the 2 chips is the same the only difference will be the extra heat created by hyper threading.
 
On FSX you want good read/write speeds as well - that's very important.

Microsoft flight simulator is very old and inefficient, it will not utilize multithreading or GPU properly, but it does read lots from the hard drives, especially with extra texture packs etc. installed.

SSDs will make a big difference. Overall, I would say single or twin SSD, 3570k and a decent GPU.

I recently built a machine dedicated for flight simulator for a customer of mine. On his old system (still very reasonable) he got as low as 2-5fps with some of his mods. Now sits running at 38fps.
 
When I say it's old, I mean it is built upon an old engine. I spoke to someone who's been working with it for a long time and basically even though FSX is fairly new... it's still built upon the old engines going back as far as 1998!

Every time they released a new version they just patched the engine instead of remaking it. Microsoft Flight is better, but it has most of the features etc. missing so not a good replacement.

CPU is very important as it won't properly utilize new graphics cards, but I'd say if you're stuck for cash spend the money on SSD. Hyperthreading isn't likely to make much difference and the 3570k is still very powerful.
 
The point is that presently a 3570k is 'more or less' on par with a 3770k in games.

However that could change in about a years time when the new consoles are out and game developers start building ever more demanding games, even then a 3770k is not an octo core CPU, its a 3570k with HT enabled.
 
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3570k over 3770k is very game dependant and if HT will cause microstutter or too much heat if your going for really high clock speed over more cores.

For instance benchmarks i saw on framelatency sometimes show the 3770k and 3930k doing better overall and keeping things around 16ms while the 3570k can differ by just 1-2ms.

Then Crysis 2 benchmark shows the complete opposite with weirdly the 3570k doing better than the 3770k and 3930k six core by 1fps and has the lowest frame latency alonside 3770k with 3930 in 3rd place.

If i went for 3770k i would be going for one just fore the flexibility of toggling HT on/off and getting maybe 100mhz overclock more due to better silicon.
 
Generally speaking, HT is good for encoding and things like that, but doesn't really benefit gaming performance even if the game were to use the extra threads. If you look at the game benchmarks, the performance of the Pentium dual-core and i3 are basically identical when they are at the same clock, even if the game being benched would use up to 4 cores/threads.
 
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