Originally Posted by steven88
I know I won't.....unless Battlefield 4 and Frost Bite 3 happens to use AVX2
But I don't think any future games will use these special instructions. I think its mostly for professional apps, right? And even then, I heard most professional apps don't even use AVX....only a select very few do.
But anyway, since I am a gamer....and I am not 100% religious and nit picking....Can you recommend Prime 95 blend (Non AVX certified) for 8 hours and call it a day? Of course, manual voltage first, then switch to adaptive later. Do you think 4.5ghz is very doable with a mediocre to decent sample chip? Or is 4.5ghz considered golden by Haswell standards?
The reason why I bring this up is because.....a month ago, the whole community was pretty much in shock how most folks are 4.2 to 4.4ghz....anything higher was pretty much a rare sight....But now that a month has passed, and more people have time to tweak their rigs....I'm wondering if that 4.2 to 4.4ghz has changed, due to the new parameters you have to tweak?
Well to state the obvious first, we all know that CPUs vary and they vary more than ever with Haswell. Having said that... Let me just give you a rundown on how I took my CPU to 4.6ghz.
1. Set Uncore AKA Ring Bus to manual. Set it to stock multiplier (x34). With ring bus running on stock and locked at stock for now, no need to fiddle with ring bus voltage. That goes to auto.
2. Set any XMP profile OFF for ram. If your ram is above 1600, set it to 1600, no higher while we're testing overclocks.
3. Start ramping up the core multiplier and voltage until you think you've found your sweet spot. Do stress test and if you pass, go to step 4.
4. Now we fiddle with ram, higher ring bus/ring bus voltage in effort to get marginally better performance. Stress test. Do not raise ring bus or ram if it means lowering core clock for stability.
5. If you are hardcore or have a lot of time on your hands, you can try adding clockstrap to the mix but I'd stay away from it unless you're super duper picky.
6. Set it to adaptive mode instead of manual now. Do not stress with adaptive.
If you simply raise the multiplier on the core and change the voltage, you'll probably run into a bad overclock because the overclocked ring bus will hinder the core overclock. And they say it but it's true: Core is king. I have a post full of benchmarks demonstrating that ring bus is a minor factor in performance. You'd generally rather have stock ring bus if that means getting 100mhz faster core clock. Same for ram of course... it's a tall order to hit DDR3 3000 with higher overclocks.
No, I doubt you'd be using AVX2. My opinion is, if you need to ask if you need it, probably don't need it. You can try running blend for 8. If you want to be more sure you can do Aida for 12. I feel that is very, very stable if it passes both of those tests. Anything more is complete overkill but of course some people swear by 24 hours or whatever. That's them. Have fun trying to hit synthetic usage on games... You won't even hit anywhere close with chess calculations. My personal standards are a bit out there but it works for me.
See, my most CPU intensive application in real world usage scenario is 24/7 chess calculation. That uses 100% all cores at all times nonstop. If I can run that without ever getting a single crash, there is no way I will crash in games. So far from what I can tell, I'm correct. But some will burn me at the stake for doing so.
But hey, it let me shoehorn in an extra 200-300mhz and it's my computer!
With the practice of lowering ram/ring bus while overclocking at first AND knowing Linpack is OP, yes, average overclocks are going up a little.Edited by Darkwizzie - 7/18/13 at 2:47am