Like cstkl1 said. The bandwidths can be improved by reducing the 3rd timings mainly the tRDRD and tWRWR, but the latency will be reduced as well.

The lowest tRDRD and tRWRW can boot at 3000 at 1.65v is 6, the bandwifths will shoot up to 30k. Will try to run it by tonight hopefully will yield the same performance without needing voltage increment.

Glad that you have made a good choice.
My 4770K is Malaysian batch L312B460.
Let's torturing.

Different chip different VID and so for OCbility. It's all about draw of luck.

btw, compression performance on Haswell is awesome. Now you can cut the time of unrarring by half.



This post has been edited by owikh84: Jun 18 2013, 11:26 PM

alright looks like we have a version of LinX working for Haswell on win7 SP1 (not Win8)

Credit to acebmxer @ XS

OMG, bad news guys.
LinX 0.6.4 (10.3.7) is actually stressing more than I thought.
Now 4.6GHz @ 1.44v will hit TJmax of 100C instantly.
Now i have to reduce overclock to 4.4GHz @ 1.375v in order to avoid from overheating.
So, from now onwards I will not use Prime95 27.9 for stability check anymore because it is not ready for Haswell thus not as stressful as LinX.

This post has been edited by owikh84: Jun 19 2013, 06:52 AM

Thank you stasio.

4770K @ 4.5GHz 1.3v | ram 3000MHz 12-14-14-25-1T

yupe thats under water.
Prime95 needs some updates for Haswell. Normally I would trust LinX or IBT only since it tell us the GFlops which shows the efficiency and accuracy of our overclocks. Eg.

4.5GHz @ 1.25v - 125 GFlops, 85C
4.5GHz @ 1.3v - 135 GFlops, 90C

The higher the GFlops, the more performance the overclock yield. So, 1.3v is picked as our preferred vCore.

That was on win7 SP1 with AVX instruction AND LinX with AVX libraries build 10.3.7.

On win7 non SP1 OR LinX non AVX, you would get:

4.5GHz @ 1.15v - 60 GFlops, 60C

lower GFlops and reduced performance of AVX supported apps and might sometimes get BSOD on routine works.

Thats why I said the hotter or the more vCore needed, the more stressful the app. Also, the more vdroop (lower load vCore) the more stressful.

I think that LinX 10.3.7 is kinda old as far as I could recall on 3770K + Z77 it needed less vCore than 11.0.1.005 but yield the same Gflops.

Hint is on the top pane of LinX.

AVX edition: less vCore needed
Simply linpack: more vCore

but generates the same GFlops.

so there is no perfect app to stress Haswell yet atm

Anyway, to choose whatever stress app is really up to you.

I even saw an OCN forummer advised fellows not to use AVX based stability tool because it doesnt represent daily routine work lol.

Another forumer from XS told me that if you could finish the Fritz Chess benchmark then your overclock should run fine on any game without stability issue.

Run some LinX w/ AVX (10.3.7) this early morning...

4770K @ 4.6GHz 1.344v | RAM: 3000MHz 12-14-14-25-2T @ 1.65v



* note that the GFlops is going down slightly as I've opened some background apps ie. CPU-Z etc.



This post has been edited by owikh84: Jun 20 2013, 07:29 AM

BCLK max out @ 198.96MHz under water.

Thanks bro
Nope, it was done with my beloved 0006.

BIOS 0503 allows me to push the PSC higher abit.

Corsair GTX4 @ 2500 8-11-8-28-1T @ 1.8v



tRDRD aka tRRSR can't go lower or code 55
Still worse than Ivy with the same kits which could do 2500 7-11-7 and 2600 8-12-8 easily.

Nice chip spotted. Later sure kelvinchen will hunt for a good Hynix RAM to strike for 3000+ IMC.
Looks like you guys had fun with overclocking there. Too bad couldn't join (I chose my GF) =.=/
Welcome back to OC world, AceMeimei

Your OC needs some tuning to make it more efficient.

4770K @ 4.9GHz and RAM @ 2600 10-12-12-27-2T:



4770K @ 5.0GHz and RAM @ 1866+ should yield 6m 20s.

This post has been edited by owikh84: Jun 23 2013, 12:43 PM

Dunno how true but this OCN guy said that he got a 4670K Costa Rica batch from NCIX.
Link

Hopefully it will hit our stores soon. Our hope for better chip.

My elder bro is no longer working for Intel USA but just changed his job to a German company and left for EU this morning.

Today I am playing with Samsung based kit. Some crazy overvoltings lol.

2800 9-12-12-21-1T @ 2.275v on air

Nice one. So he wasn't cheating.
I guess Costa 4770K is also around the corner.
Can't wait to grab some of them.

Ring = uncore

Long time didn't stress with slow RAM

PSC @ 2200 7-10-7-28-1T

Thanks. Next try would be 2400 8-11-8 @ 1.65v