Be happy with 4.5ghz oc or go for 5? i5 2500k

Ok so I only use my pc for gaming and everything runs like a dream, but since oc'ing to 4.5 was so easy should I try and go higher? These are the settings I used for a 4.5 oc

Ai Overclock Tuner - Manual
BCLK/PEG Frequency - 100
Turbo Ratio: 45
Memory Frequency - 1600mhz
CAS Latency - 9
RAS to CAS Delay - 9
RAS Pre Time - 9
RAS ACT Time - 24
DRAM Command Mode - Auto
CPU Voltage - Manual Mode
CPU Manual Voltage - 1.25v
DRAM Voltage - 1.5v
PLL Overvoltage - Disabled

Running Prime95 over night I got 0 errors and my temps were a solid 57c except for one core occasionally hitting 61c (used coretemp and realtemp). So what do you guys think don't mess with a good thing or go for 5.0?

Nice work
You have a very nice CPU there, 4.5 Ghz with only 1.25v, going up to 5 Ghz should be possible, you will most probably have to go around 1.40-1.45v is my guess as the scaling is not linear. At your current load temps I would say definitely go for 5 Ghz

Wow, nice, wish my chip did 4.5Ghz at 1.25v! Currently running mine at 4.5Ghz at 1.344v load I think my memory might be killing me though, when I rum P95 for a while, it doesn't BSOD, it just freezes... Anyways, why not push it a little? Looks like you got a great chip!

Ok so far I've been unsuccessful I tried 4.8 at 1.37 but my pc would only boot up to the windows logo and stay there. You guys think I just need to add more vcore, or are there some other settings I should be adjusting when trying to oc past 4.5?

I ran Prime95 for 9 hours at my 4.5 settings just to make sure I was stable even at these settings and I got 0 errors.

As I said voltage scaling is not linear, you will need 1.4 v to run at 4Ghz and up to 1.45v (or even a bit more) to get to 5 Ghz.
Trial and error