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Future SLI options with PSU

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December 26, 2013 9:43:20 AM

This is currently what I'm planning on purchasing: http://au.pcpartpicker.com/p/2qkep

In future if I decide to purchase another 770 will 650w suffice?

If you have other parts I should purchase instead please post below. Only part I've already purchased is the 770 as it was on sale. Also it had costed me $103 to upgrade to a 4670k and a decent z87 mobo to oc. Planning to oc for casual video encoding/ rendering. Was also planning on oc my gpu for gaming. Thoughts?

Thanks

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December 26, 2013 9:47:04 AM

Personally, I think that a 650w will cover it. As for the overclocking, that's not really my topic.
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December 26, 2013 9:49:09 AM

Well it says 658w on pc part picker when i added another 770. But yeah I'd like to know some info on overclocking with my needs
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December 26, 2013 9:52:24 AM

It should be enough but you will be running that PSU somewhat close to its limits - you should be around 550W peak if you do not OC, which should be fine for a 650W 80+Gold PSU.
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December 26, 2013 9:54:25 AM

It's always better to have more room when you're adding a second card and/or overclocking. You never want to be pushing the limits of your PSU constantly. That being said, I would recommend a GOOD 750W unit. That should suffice, and would likely be the bare minimum I would go with SLI. But I wanted the extra head room, so I went with a 860W PSU with my two GPUs.
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December 26, 2013 10:07:27 AM

I'm probably going to go with the Antec True Power Classic 750W for $149 if I decide to go SLI in future. Anyone know if it's fairly quiet around 20dB? Can't find any of that info online besides: "120mm PWM fan runs up to 50% quieter than standard fans". Also, will 650W be suffice for just overclocking the CPU and GPU without SLI?
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December 26, 2013 10:10:41 AM

enemy1g said:
You never want to be pushing the limits of your PSU constantly.

Good thing worst-case power consumption usually involves FurMark which is optimized to drain power by intentionally wasting GPU processing power instead of achieving visual output in the most efficient way possible. Real-world applications usually cause GPU power peaks 20-30% lower than FurMark does... so, while he might pull 550-600W with FurMark + Prime, he would probably only hit 450W while running actual games.
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December 26, 2013 10:14:15 AM

symsus said:
Also, will 650W be suffice for just overclocking the CPU and GPU without SLI?

You should not be able to get anywhere near 650W even if you overclocked the heck out of your current components even with FurMark and Prime running to maximize load.
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December 26, 2013 10:17:27 AM

yeah thought so no worries cheers. Do you have knowledge on overclocking in terms of value? It would cost me $103 to get components to overclock. IS it worth it?
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December 27, 2013 7:34:14 AM

symsus said:
Do you have knowledge on overclocking in terms of value? It would cost me $103 to get components to overclock. IS it worth it?

Personally, I have had OS corruption two or three times due to overclocks looking stable but actually silently corrupting data without crashing applications or the whole computer until several days later. The weeks spent checking files for corruption afterward was definitely not worth the ~20% performance increase IMO.

Instead of spending over $100 extra to enable overclocking for only 10-20% extra performance that might backfire, I prefer setting that $100 aside for my next rebuild which will likely be over 70% faster.
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December 27, 2013 8:45:38 AM

Interesting ... what do you mean by stable. The specifications for the 4670k mentions that the clock speed is 3.4Ghz with a max turbo frequency of 3.8gHz. I was planning on overclocking to about 4.3 - 4.5Ghz. Is this what you overclocked to? I was also planning on overclocking my gpu for more fps.

Also are you able to link/ tell me a guide to overclocking as I don't quite understand the whole concept of multiplers etc. I only know a few things such as keeping temps under 40 degrees and keeping voltage level below 1.5V but I'm not sure how to slowly increase each separate component.

The gpu I'd imagine would be easier as I've researched that the MSI afterburner could easily help with it.
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December 27, 2013 10:39:31 AM

symsus said:
Interesting ... what do you mean by stable. The specifications for the 4670k mentions that the clock speed is 3.4Ghz with a max turbo frequency of 3.8gHz. I was planning on overclocking to about 4.3 - 4.5Ghz. Is this what you overclocked to? I was also planning on overclocking my gpu for more fps.

My overclocks were on past PCs and the data corruption was from when I tried OCing my C2D-E8400 to 3.5-3.6GHz: the OC seemed fine with memtest86 and Prime but data and OS files got corrupted over time. Re-installed the OS, tried OCing again, same thing happened. Re-installed without OCing and that computer never crashed again.

For IB/Haswell, 4.2-4.3GHz is usually an easy overclock - just need to put a decent aftermarket HSF and increase the max multiplier. I have no idea where you pulled that temperature and voltage from: under heavy load, most modern CPUs operate in the neighborhood of 55-80C depending on how beefy the HSF is and at 22nm, you probably do not want to push your luck too far beyond 1.3V since Haswell's stock core voltage is 1.0-1.2V. The thermal resistance from die to HSF is likely too high to achieve the 40C (core?) temperature you mentioned without using phase-change or other esoteric cooling... or puttingt he PC outdoors when temperature is below 10C.
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December 27, 2013 11:55:36 AM

oh alright cheers. I think I'm gonna just not overclock the system until games get more laggy :) . One last question, what's the point in overclocking the cpu in terms of for gaming and video editing. For gaming apparently there won't be too much of a difference. Thanks!
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December 27, 2013 12:20:24 PM

symsus said:
One last question, what's the point in overclocking the cpu in terms of for gaming and video editing. For gaming apparently there won't be too much of a difference. Thanks!

The difference is the CPU is done doing whatever it needs to do 10-20% sooner. Whether or not you will actually notice a difference can vary substantially on a case-by-case basis. For games, this may translate into more steady if not higher frame rates and for rendering, it simply translates into shorter processing times.

Personally, I usually find reasons to walk away from the PC or just do something else on it when I'm making it do something that takes a while - it does not matter how fast or slow (within reason) it is as long as I do not run out of other stuff to do while "waiting" - it does not really count as waiting if I'm doing other stuff that I was going to do sooner or later anyway.
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