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Which cpu skylake?

post #1 of 17
Thread Starter 
Hi, I'm building my first gaming pc, and I'm undecided between the i5 6400 and i5 6500 because if I pick the 6400 I have the budget to pick this http://www.asrock.com/mb/Intel/H170%20Pro4Hyper/ and do the overclock of the cpu.
but on the Internet I don't found any review of it,should I simple buy a 6500 and no overclock or the 6400 and overclock it?

Another question is that the motherboard only supports ram until 2133mhz, in bclk overclock isn't necessary faster ram?

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post #2 of 17
I think it's not worth it to go for a non-K CPU and non Z170 motherboard if you are intending to overclock the CPU. Get a K SKU processor and a Z170 motherboard. Trust me it's not worth the hassle finding out in the end it might not even let you overclock your CPU. H170 does not support overclocking while Z170 does support overclocking.
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post #3 of 17
You can only overclock the 6600K or 6700K CPUs, which as mentioned above should be (ideally) coupled with a Z170 mobo. If you opt for 6400 or 6500 you should probably go for a H170 or even lesser chipset. To answer your question, between these two CPUs, I'd personally opt for the 6500 - the 500MHz difference is too large to pass up on. Else, if you are dead set on overclocking, you'll need at least a 6600K and a bit more money.
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post #4 of 17
1) The i5-6400 and the ASRock Hyper board are a perfect match. The boards was designed with the purpose of non-Z overclock and features an external clock generator for this purpose.

2) As far as memory choice, do not go with a standard DDR4-2133 kit. When base clock overclocking you will be raising memory frequency proportionally to your base clock increase, so you will want a good bit of headroom. Since they are not much more expensive, I suggest RAM rated at least 3000MT/s, but preferably as high as you can afford on your budget.

Example:

To achieve a 4.6GHz CPU overclock with an i5-6400 you will need to raise your base clock to 170.4MHz, which will raise DDR4-2133 to 3634MT/s. Obviously a generic DDR4-2133 kit would not be able to run that fast.

With that said you will need to see what gives more clock headroom per dollar when you make your purchase. It could very well be cheaper to get a slightly higher clocked i5-6500 since it starts with a higher base clock and will allow for lower speed RAM required to reach the same CPU clock.

Example: To achieve a 4.6GHz CPU overclock with an i5-6500 you will need to raise base clock to 143.8MHz, which would raise DDR4-2133 to a speed of 3066MHz. That's much easier to do than on the i5-6400 simply because of RAM frequency headroom.
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post #5 of 17
Quote:
Originally Posted by benjamen50 View Post

I think it's not worth it to go for a non-K CPU and non Z170 motherboard if you are intending to overclock the CPU. Get a K SKU processor and a Z170 motherboard. Trust me it's not worth the hassle finding out in the end it might not even let you overclock your CPU. H170 does not support overclocking while Z170 does support overclocking.

Quote:
Originally Posted by haha216 View Post

You can only overclock the 6600K or 6700K CPUs, which as mentioned above should be (ideally) coupled with a Z170 mobo. If you opt for 6400 or 6500 you should probably go for a H170 or even lesser chipset. To answer your question, between these two CPUs, I'd personally opt for the 6500 - the 500MHz difference is too large to pass up on. Else, if you are dead set on overclocking, you'll need at least a 6600K and a bit more money.



Both of these statements are very incorrect.
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post #6 of 17
Quote:
Originally Posted by damric View Post


Both of these statements are very incorrect.

Officially, you are not supposed to OC non K CPUs, but some manufacturers mobos are still supporting this. I would personally not recommend this, but I'm sure many would. If this is what you are referring to then fine.
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post #7 of 17
Quote:
Originally Posted by haha216 View Post

Officially, you are not supposed to OC non K CPUs, but some manufacturers mobos are still supporting this. I would personally not recommend this, but I'm sure many would. If this is what you are referring to then fine.

The whole purpose of overclocking is doing it because you can, not because you are supposed to do so.
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post #8 of 17
Quote:
Originally Posted by damric View Post

The whole purpose of overclocking is doing it because you can, not because you are supposed to do so.

Fair enough, although Intel have been attempting to block Sky OC since mobo manufacturers have been releasing the feature. I agree that overclocking should be open to any CPU (at users risk), although Intel have different ideas - and they make the chips. But i concede, you are totally right that non K CPUs can be OCed.
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post #9 of 17
Thread Starter 
Quote:
Originally Posted by haha216 View Post

Fair enough, although Intel have been attempting to block Sky OC since mobo manufacturers have been releasing the feature. I agree that overclocking should be open to any CPU (at users risk), although Intel have different ideas - and they make the chips. But i concede, you are totally right that non K CPUs can be OCed.
Quote:
Originally Posted by damric View Post

1) The i5-6400 and the ASRock Hyper board are a perfect match. The boards was designed with the purpose of non-Z overclock and features an external clock generator for this purpose.

2) As far as memory choice, do not go with a standard DDR4-2133 kit. When base clock overclocking you will be raising memory frequency proportionally to your base clock increase, so you will want a good bit of headroom. Since they are not much more expensive, I suggest RAM rated at least 3000MT/s, but preferably as high as you can afford on your budget.

Example:

To achieve a 4.6GHz CPU overclock with an i5-6400 you will need to raise your base clock to 170.4MHz, which will raise DDR4-2133 to 3634MT/s. Obviously a generic DDR4-2133 kit would not be able to run that fast.

With that said you will need to see what gives more clock headroom per dollar when you make your purchase. It could very well be cheaper to get a slightly higher clocked i5-6500 since it starts with a higher base clock and will allow for lower speed RAM required to reach the same CPU clock.

Example: To achieve a 4.6GHz CPU overclock with an i5-6500 you will need to raise base clock to 143.8MHz, which would raise DDR4-2133 to a speed of 3066MHz. That's much easier to do than on the i5-6400 simply because of RAM frequency headroom.

Thank you,you solved many of my doubts biggrin.gif
This ram are good enough? my budget allows only this http://www.newegg.com/Product/Product.aspx?Item=N82E16820104571
so in the site of motherboard says "Supports Dual Channel DDR4 2133, DDR4 Non-Z OC " , the mobo does support this ram?

At the end ,do you suggest to do this or pick up the 6500 and live happy witouth oc? the 4.5ghz6400 is much better than 6500 stock?
post #10 of 17
Thread Starter 
Quote:
Originally Posted by haha216 View Post

Officially, you are not supposed to OC non K CPUs, but some manufacturers mobos are still supporting this. I would personally not recommend this, but I'm sure many would. If this is what you are referring to then fine.

so for you should i pick a 6400 or a 6500 stock? the differences in game between the two are relevant?
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