How much performance would I gain in FSX from overclocking a 4770k from 3.5 to 4.5 ?

 

I just need rough numbers here

 

 

The answer is very much dependent on FSX settings. In the FSXMark11 thread, Charlatan posted scores for his i5 4670K @ 4.2 and 3.4GHz showing about a 50% return per % overclock on average FPS achieved for the Haswell CPU architecture. On that basis, you can expect roughly a 15% average FPS boost going from 3.5 to 4.5GHz in that benchmark.

I would bet even better.

About 20% difference and some addons do not require overclocking to run smoothly. Overclocking reduces stuttering and autogen popups. Get low FPS overclocking won't make much difference if you run too high of settings.

I've been running FSXMark11 at various overclock settings on my 4690K (same base clock as 4770K of 3.5HGz and boost of 3.9GHz).  I can confirm that my FPS only increased by 7% by clocking up from 3.9GHz (the boost speed) to 4.5GHz (the overclock speed). This is consistent with what I stated earlier in this thread that you will only get about half of the % increase in clock speed, which was 15% in this case.

 

While this result is a little disappointing, the great news is how well the 4690K, and likely even better the 4770K, performs in FSX at stock speeds. You should be looking at around 30 FPS minimum in FSXMark11, which is a very good starting point before addons take their FPS toll.

I've just got a Pentium G3258 to play with on my spare machine, so will have a play on that in the next few weeks and see what sort of FSX performance we get with a cheaply clocked system.

My current system, which I bought preclocked, is a SB2500 which runs at 4.6ghz. However, my previous rig was a 950 (i5?) with a stock speed of 3.3. I OC this to 4.2 and saw an overall performance boost of about 20-25%. However, I also saw, not unsurprisingly, an improvement in smnoothness.

The FSX frame rate is, according to my experience, very much dependent on the CPU clock frequency. Overclocking my (in the meantime pretty old) system from 3.15 to 3.99 GHz led to a FPS increase of roughly 25%, which means that it is more or less proportional to the clock frequency. This ratio might not hold completely for newer CPUs but I would still expect a frame rate increase of well over 20% in your case.

For those thinking 20%+, keep in mind that the 3.5 for the 4770K with intel boost enabled is actually 3.9, so the overclock to 4.5GHz is only a 0.6GHz increase, not a 1GHz increase as you may be thinking. Even if you FSX scaled perfectly with clock speed, the BEST FPS increase achievable would be 15% (ie. 4.5/3.9 - 1). The reality is about a 50% return for Haswell overclocking, hence my seemingly pessimistic 7% estimate.