EPTThe Haswell overclocking thread - Page 7
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mav451
United States1596 Posts
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Aylear
Norway3988 Posts
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reikai
United States359 Posts
Can you share some of this advice? Haswell is my first CPU and this is also my first custom built computer, and would like some basics on how to OC. EDIT: Cyro, feel free to jump in and help a newb too, if you have extra time  | ||
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Cyro
United Kingdom20323 Posts
 What motherboard and cooling do you have? | ||
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reikai
United States359 Posts
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Cyro
United Kingdom20323 Posts
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Aylear
Norway3988 Posts
Yeah, the OP is pretty much wrong on most counts, partly because Haswell goes against some established overclocking conventions and we didn't know that before we started working on it. Cyro's the man to talk to, though. I could talk about OCing a Haswell but I'd simply be parroting his advice (and with a weaker understanding of the underlying mechanics behind said advice). Good luck with your OC, hope you won the silicon lottery. I can say one thing about it: The Hyper 212 Evo is a beast of a cooler, both in size, price, and efficiency. If your computer case can fit that monstrosity it's worth checking out. | ||
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Cyro
United Kingdom20323 Posts
The Hyper 212 Evo is a beast of a cooler, both in size, price, and efficiency. If your computer case can fit that monstrosity it's worth checking out. It's lower end, though. In the UK, i5 costs ~£165, i7 costs ~£250. 212 costs about ~£20 better stuff such as true spirit 140 power or hr-02 macho come in around ~£33 you can get some of the best air coolers for ~£55 If you're spending £265-350 on CPU and mobo, then saving £13 or even £35 on cooling isn't a big deal, while some people are quite bothered about losing 200mhz. As for US pricing though.. they have less choice in the midrange (?) and i think it was worse compared to CPU/s + Mobo's. Maybe i'm just not used to dealing with higher dollar values. My personal choice for cooling i5 cheaply and efficiently would probably be a true spirit 140 power with a ty-143 added on it - but that's both not available in the US, and quite noisy when all CPU cores are very highly loaded. It's like 10-15c better than 212 evo though. Very cost efficient way of approaching higher voltage overclocks. Looking over temperature data, i think 212 is usable but also that some people might be unhappy with it: Pre-devil's canyon users with undelidded CPU's - 4670k is usually ~6-8c hotter than 4690k i7 users, especially 4770k - they run ~10c hotter than i5 with the extra threads loaded people who want to max OC in general with good temperatures If you wanna save money and you're running an i5 4690k.. it's quite hard to argue against it in US i guess - but that's a good case for it. I haven't been a big fan of it since we moved away from Nehalem and Sandy Bridge being easy to cheaply cool. | ||
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reikai
United States359 Posts
How do I go about overclocking my 4670K? If possible, both generic newbie advice (This will be my first one) and Haswell-specific advice would be appreciated. :D EDIT: In other words, a moderate overclock will suffice, I don't need to race the clock. Assume I know nothing about OC :D | ||
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Cyro
United Kingdom20323 Posts
ok.. Most important voltages for OC: Input V (aka VRIN) - the voltage supplied to the CPU which is then turned into a huge list of other voltages by the integrated voltage regulator. Usually best around 0.6 higher than vcore, there are some rules. Good range is probably ~1.7 to 2.0 - some people use significantly more at times but there are questions of what this means for the chip, performance and also lifespan - and using lower values past a certain point might not be necessary nor helpful in any meaningful way. That is to say, there might not be any point going below ~1.7 for a very low voltage, or if you have a 1.25vcore, 1.85 VRIN overclock, there is little to no perceived or even proven benefit that i've seen from trying to stabilize say 1.25vcore, 1.75 VRIN. This is probably the most important voltage because it sources everything else, and a lot of novice overclockers and reviewers don't respect it properly and get a sub-par experience as a direct result of that. Vcore - Core voltage, has to be above a certain point for X frequency to be stable. If there's no other problem causing stability other than too low vcore, it can be safely increased, usually to ~1.35 or so. Uncore/Ring/Cache voltage, known as Ring on gigabyte boards. Used somewhat for general chip stability(?) but mainly increased for raising the uncore multiplier. Best to use ~0.1v below Vcore on a general OC, because it's not efficient in terms of performance or lifespan of the chip to push it higher. A ring voltage at 1.4 will be more dangerous than a vcore at 1.4. --- For a basic, simple Haswell OC, you can get some software (i wrote more here, but eh, simple is better): An x264 package, set up somewhat to increase CPU load compared to just randomly encoding something - https://mega.co.nz/#!3tAGnAqZ!QbCz2r1fG0WjM8DgGYeExngGypaHftAzPUgTSn2kAdk important settings: VRIN - 1.85 Vcore - 1.23 Ring - 1.15 Under advanced power settings(?), there is an LLC setting for VRIN. You can set it to "turbo" out of the options available. ^After that, set core multiplier to ~42. under advanced core settings(?), set uncore multiplier to 33. I think that's everything to do before booting up - run that test, "x264 Stability Test (64bit - log)" is what i have to run, set it to use 8 threads, 3 loops. Check temperatures and clock speeds in hwinfo sensors tab - www.hwinfo.com - to make sure that they are correct (core temps under 80 or so, core clock speed at 4200mhz, vcore on the sensor near the bottom called "vcore" at ~1.25, etc) and if they're fine, wait for it to complete. You can keep doing that on different settings. If 4200mhz core passes, reboot and try 4300mhz. If that passes, try 4400mhz etc. One of them will crash with some bluescreen error message or just crash the encoder, at that point just go down 100mhz, set it to pass 10-20 loops and when you've done that, increase vcore and VRIN by 0.02 (to 1.25 vcore, 1.87 VRIN) There's a lot more to do, but i think that's a pretty foolproof way to get a basic OC where it's very unlikely to have any problem aside from vcore/core multiplier being off. After that's done, go to bios and manually enable c3, c6/c7 and EIST. Boot into windows and make sure the power plan is on balanced. Open Hwinfo, it should show core speeds, uncore speeds and further down, that "vcore" sensor - ignore the readings labeled VID. If that worked as expected, core speeds and Vcore should drop when your system is idle, but uncore will be locked at 3300mhz. Just leave it that way for a while and use your system for like a week to make sure stuff works, then it can be adjusted to work at a variable speed (such as 800mhz-4000mhz) - it's not important for performance, so don't worry about it If you want a very very basic like how do CPU's and voltages and clock speeds work, then i'm not your person for that unfortunately :D | ||
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reikai
United States359 Posts
This is exactly what I needed. Thanks so much ) | ||
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Cyro
United Kingdom20323 Posts
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