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I7 3820: Do I need to overclock RAM?

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  • Overclocking
  • 3820
  • RAM
  • CPUs
  • 3930k
  • Intel i7
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April 5, 2013 3:18:06 PM

Hello,

So i'm deciding between the i7 3820 and the 3930k for my new rig. Well, i decided that on 11. February,
And ordered it on 12. Feb. but the components still arent here, so i'm canceling and ordering from somwhere else. But this made me think.

I'm a triple screen gamer, and for this new rig i bought 2X XFX 7950 Black Double D. Ill run them in crossfire. Im wondering if I should get the i7 3820 or 3930k.

Before you say "get an i5". No, thanks. I frequently make intros, videos (Vegas Pro, after effects...) and Photoshop stuff.

My main problem is this: since the maximum multiplier in the i7 3820 is 44, can I only get 4.4ghz? I know about the memory bus trick. BUT doesnt that mean overclocking the RAM? My ram is 3X4gb Silicon Power DDR3 1600mhz. It has no heatsinks and nothing. It's literally $20 RAM.

The i7 3820 is 300€, i7 3930k is 540€.

What do you think. My motherboard is (already bought) Asrock X79 Extreme4. The only asrock mobo in my country... *facepalm

Thanks

More about : 3820 overclock ram

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April 5, 2013 5:09:26 PM

http://www.anandtech.com/bench/Product/523?vs=552
The above link suggests they are almost on par, with the 3930k pulling ahead in some aspects.

The 3820 multiplier is partially unlocked with a maximum of 43. This allows a max overclock of around 5 ghz provided you have extremely good cooling. 4.5 ghz should be more achievable with less cooling. Mind you, I don't have this CPU personally, but because it is not fully unlocked (unlike the 3930k), it will require changing the FSB as well. It will be trickier so don't push it.
I'd recommend a muliplier of 37 with a blck of 125. This would result in 4.6 ghz OC.

In regards to the 3930k, it is fully capable of oveclocking. This means a max OC to 5.7ghz. But 5ghz is more reasonable with sufficient cooling.

I would not say however the full OC capability of the 3930k justifies the 240 difference. You can easily OC the 3820 with the help of tutorials online ( and even on this forum). BUT it really depends on how intensive your work will be.

In the end, the 3930k is always going to be faster. When it comes to video encoding and the like, the difference is only going to be a couple of minutes.

The motherboard you bought is quite good, and I don't see anything wrong with it.

As always, if I have helped, please consider choosing my answer as the solution. Thanks :) 

edit: 3820 is 4/8 (core/threads), while the 3930k is 6/12.
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April 5, 2013 5:25:28 PM

You will need to OC the 3820 to around 4.75Ghz to be on par with a stock 3930k.

In regards to your RAM, that should be okay.

If you have the money, then 3930k why not? Needless to say, the 3930k would eliminate any potential bottlenecks and uncertainties with regards to 2x 7950. I know for a fact that a 2500k at 4.5 ghz would bottleneck 2x 7950.
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April 6, 2013 12:48:08 AM

oddlyinsane said:
http://www.anandtech.com/bench/Product/523?vs=552
The above link suggests they are almost on par, with the 3930k pulling ahead in some aspects.

The 3820 multiplier is partially unlocked with a maximum of 43. This allows a max overclock of around 5 ghz provided you have extremely good cooling. 4.5 ghz should be more achievable with less cooling. Mind you, I don't have this CPU personally, but because it is not fully unlocked (unlike the 3930k), it will require changing the FSB as well. It will be trickier so don't push it.
I'd recommend a muliplier of 37 with a blck of 125. This would result in 4.6 ghz OC.

In regards to the 3930k, it is fully capable of oveclocking. This means a max OC to 5.7ghz. But 5ghz is more reasonable with sufficient cooling.

I would not say however the full OC capability of the 3930k justifies the 240 difference. You can easily OC the 3820 with the help of tutorials online ( and even on this forum). BUT it really depends on how intensive your work will be.

In the end, the 3930k is always going to be faster. When it comes to video encoding and the like, the difference is only going to be a couple of minutes.

The motherboard you bought is quite good, and I don't see anything wrong with it.

As always, if I have helped, please consider choosing my answer as the solution. Thanks :) 



edit: 3820 is 4/8 (core/threads), while the 3930k is 6/12.


oddlyinsane said:
You will need to OC the 3820 to around 4.75Ghz to be on par with a stock 3930k.

In regards to your RAM, that should be okay.

If you have the money, then 3930k why not? Needless to say, the 3930k would eliminate any potential bottlenecks and uncertainties with regards to 2x 7950. I know for a fact that a 2500k at 4.5 ghz would bottleneck 2x 7950.


What you told me was extremely helpful. Thank you very much. The problem is... I don't know how to choose the best answer, although i would love to choose yours! So if you can tell me how, i will choose it.

Also, if I'm going to order from somwhere else (which i probably will), i'm going with the 3930k. It seems to be good at avoiding bootlenecks as you said. Since my mobo has 3 PCI-E 16X slots, maybe in a year or two i will do a triple crossfire configuration, guessing thAt the well overclocked 3930 wont fall there either.

As for cooling, i'm probably getting the Corsair H100i. It's like 90€ while he H100 is 86€ so i guess it's good cooling.

Thanks you very much, just help me pick the best answer!
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a b K Overclocking
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April 6, 2013 12:55:13 AM

It's because this thred is a discussion, and not a question!
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April 6, 2013 7:13:24 AM

oddlyinsane said:
It's because this thred is a discussion, and not a question!


I asked a moderator to turn it into a question, so i could pick the best answer. Sorry for that, and thank you very much. I will tell you how it goes, when i get the components.

Thanks
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a b K Overclocking
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April 6, 2013 5:07:48 PM

No problems :) 
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April 7, 2013 2:38:13 AM

oddlyinsane said:
It's because this thred is a discussion, and not a question!


oddlyinsane said:
No problems :) 



Wow, i forgot to ask. For the 3930k and crossfire 7959s a 850W will be enough right? Its the Corsair TX-850 enthusiast series
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April 7, 2013 5:55:43 PM

gustafangus said:
oddlyinsane said:
It's because this thred is a discussion, and not a question!


oddlyinsane said:
No problems :) 



Wow, i forgot to ask. For the 3930k and crossfire 7959s a 850W will be enough right? Its the Corsair TX-850 enthusiast series


Enough.
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April 28, 2013 2:04:49 AM

oddlyinsane said:
gustafangus said:
oddlyinsane said:
It's because this thred is a discussion, and not a question!


oddlyinsane said:
No problems :) 



Wow, i forgot to ask. For the 3930k and crossfire 7959s a 850W will be enough right? Its the Corsair TX-850 enthusiast series


Enough.

Well, i promised you to tell you how it goes, when i get the components. I got them and it's a dream. I ended up with the 3930k, and it's the best gaming/high-end video editing machine! Can't wait to try out Crysis 3 Maxed out! Thanks for your help.

Oh, I got the Corsair H100i Cooling too, and even if I'm gaming 3 hours it doesn't go over 40C, so ill probably overclock it, but I'll have to go around the fast-boot thing, because my bios screen doesn't even show up xD

Other than that, NO crashes, NO freezes, nothing... really good! thanks :D 
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