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Choosing RAM for Asrock p67 fatality pro and OCing my i7 2600k

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June 24, 2011 10:35:42 AM

Hey guys,

I am building my new rig. It will be used primarily for gaming.

Specs are:

asrock p67 fatality professional
core i7 2600k
msi twin frozr 3 gtx 570 (later will be bought the second one)
corsair 1200 ax (1200 wats)

There couple of questions i have.

1. I heard that asrock p67 fatality professional mobos are very ram brand specific?! a lot of people would advise me to use kingston hyperx. Heard there were issues with corsair dominator.
2. Which ram mhz should i choose, to overcloack my processor safely (oc will be 4ghz-4,5ghz probably)? i read on other forums that i should be buying no less than 1866 mhz ram.
3. And what would be the adequate amount of GBs of RAM for a gaming pc?

Thx in advance
a c 104 } Memory
June 24, 2011 2:03:28 PM

1) It is best to pick compatible ram. If you ever should have a problem, you want someone on your side.

2) To find compatible ram, go to the motherboard web site, and find their QVL ram list. This is a list of ram parts that have been tested and work with the motherboard.
Alternatively, go to the ram vendor's web site, and access their ram selection app. Enter your motherboard, and you will get a list of supported parts.

3) The sandy bridge integrated ram controllers are very good. They are able to keep the cpu fed with data from any speed ram, and not lose performance. The difference between the slowest ram and the fastest will make a difference of perhaps 1-3% in FPS or real app performance. Synthetic benchmarks will show major differences, but are irrelevant. Only if you are in an overclocking contest seeking the max oc should you pay extra for faster ram.

4) Do not pay extra for fancy heat spreaders, they are mostly for marketing. Some tall heat spreaders will bump into some cpu coolers and be a negative.

5) An OC to 4.0 - 4.5 will not be affected by ram speed. DDR3-1600 ram is more than you need, but since the price premium for 1600 is not much more than 1333 or less,
that speed seems reasonable to me.

6) No game that I know of will use up 4gb of ram by itself. Ram is cheap these days, and there is some value in 8gb. If you do lots of multitasking added ram can help.
Extra ram will let windows cache more code, resulting in faster access. Here is a study on the value of 8gb:
http://blog.corsair.com/?p=65 I suggest a 8gb kit(2 x 4gb) if your budget allows. It will cost you $75-$85.

--------------other comments:---------------

A 2600K will cost $100 more than a 2500K, and will not be any better for gaming.
If $100 is unimportant to you, then there is no downside to a 2600K.

Otherwise, use the $100 elsewhere. A GTX580, or a SSD perhaps.

The corsair 1200 is a fine psu, but way overkill.
A quality 850w unit can run two GTX570's
Not much more can run dual GTX580.
I might suggest the PC P&C silencer 910 ah near half the price:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The savings will get you a GTX580 up front, and you may never even need to go sli.
June 24, 2011 4:57:40 PM

geofelt, thank you for your reply.

The parts are mentioned are bought already( except for the psu) are bought already.
I see your point about 2600k/2500k processor, though 2600k has hyper-threading, which might be of use to me later on( now i do some light video editing on my other pc, might switch to this one later on)
As for the GTX 580, i dont really see a big gap between the two, so ill probably stay with gtx 570, and buy the second one, when it drops in price.

And are you sure i am gonna be okay with 1600mhz when overcloacking to 4-4,5 mhz? I heard different opinions...)

As for the psu- its more like an investment , for the future build (may be on lga 2011).
It is just one question to clarify; will a 1200 watts psu (80 plus gold) be consuming more electricity than lets say 950 watts psu (80 plus gold), taking into account that they bouth would work at 850-900 watt load?

Installing 8 gbs, means i need to switch to 64 bit system, but i heard that a lot of software and games are still being build using 32-bit structure, and virtualisation and "xp mode" is just not worth it?!

if you or someone can comment on those questions, that'll be great!)
Thanx in advance
Related resources
a c 347 } Memory
June 24, 2011 5:15:29 PM

Regarding the 1600 CAS 8-8-8, for gaming 2133 or 1866 offers no increases in FPS. Right now the best deal are the Ripjaws X 2x4GB 1600 CAS 8 12800CL8D-8GBXM but they just sold out.

Regarding the PSU, I have a tendency to oversize allowing for both CPU & GPU OC and PSU's are more efficient and last a lot longer at 50-60% load. Use Corsair's PSU finder to see for yourself -> http://www.corsair.com/learn_n_explore/
a c 104 } Memory
June 24, 2011 5:44:59 PM

1) 1600 ram is fine. I use 1600, let it default, and have an eacy oc to 4.0. I could go higher, but I don't need it.

2) A psu will only consume as much power as it needs, regardless of it's maximum capability.
A gold certified psu will use a bit less than silver or bronze at the same power level.
But, you would have to use it a very long time to make up the cost difference of a gold psu from electricity savings. But, I like gold if the price premium is not too great.

If a psu capacity greatly exceeds it's usage, it will be less efficient. A psu will usually be the most efficient in the middle third of it's range.

3) A GTX560ti will not use near the capacity of a 1200w psu.


4) A 64 bit os has no problem running 32 bit apps or games. Only old 16 bit dos games like civ2 2.42(one of my favorites:(  ) can't run on a 64 bit system.
Any current games should run fine on a 64 bit os. Developers have an interest in selling their games to the largest market. A game that won't run on today's 64 bit OS will not sell as much.

5) I would not count on a future drop in price for the GTX570. In time, it will be obsoleted by faster and cheaper cards. The GTX570 price will be buoyed up because those needing a sli upgrade have nowhere else to go. At that time, your best upgrade will likely be to sell the GTX570 and replace it with the next best thing. In the mean time, you will have spent extra pn a psu and whatever to provide for an upgrade that may be unattractive. My suggestion is to get a GTX580 up front and don't look back.
Only if you can forsee triple monitor gaming, or perhaps a 2560 x 1600 monitor would planning for sli be indicated. Just my opinion.
a b } Memory
June 24, 2011 5:46:31 PM

Ram speed has no effect on cpu OC on sandy bridge as it uses only* the multiplier to OC. *You can change the fsb but it is not recommended. Here is an article about best ram for SB. http://www.bit-tech.net/hardware/memory/2011/01/11/the-...

There is no need for virtualization of 32 bit programs on a 64 bit OS. 32 bit is natively supported. You should have no problems running 32 bit games and software. You could even google the software you use and see for yourself.
a c 104 } Memory
June 24, 2011 6:22:12 PM

jaquith said:
If you have Pro or Ultimate -> http://windows.microsoft.com/en-US/windows7/products/fe... it runs okay.


I tried XP mode on the beta version of windows-7. Sadly, it did not work. Apparently civ2 used some coding techniques that caused problems. It sort of ran, but there were stops and stutters that made the game unplayable. Civ2-MGE can be made to work, but the overly aggresive ai makes it no fun.
a c 347 } Memory
June 24, 2011 6:51:20 PM

We use it for an old incompatible App Adobe PageMaker Pro 7; too lazy to convert all the docs to Publisher ;)  Otherwise a BIOS Profile and and old SATA HDD for an XP native boot drive. Just putting it out there... :) 
June 24, 2011 7:24:27 PM

Thank you for all your input guys, it was very helpful!
Geofelt can you tell me which processor and memory do you have?
June 24, 2011 7:25:29 PM

k1114 said:
Ram speed has no effect on cpu OC on sandy bridge as it uses only* the multiplier to OC. *You can change the fsb but it is not recommended.


Is it possible to explain a bit further?
a c 104 } Memory
June 24, 2011 7:53:03 PM

RRoller said:
Thank you for all your input guys, it was very helpful!
Geofelt can you tell me which processor and memory do you have?

I have a 2600K on a Asus P8P67-M-PRO.
I have a g.skil 8gb kit(2 x 4gb) of DDR3 1600 ram part # F3-12800cl9-4gbrl.

On earlier cpu's the FSB(front side bus) was the clock for everything. If you increased it, you got your oc, but it also changed the ram speeds.
On sandy bridge, you just change the multiplier.
It is possible to increase the BCLK perhaps 3%, but that does not seem like much worth it.
a b } Memory
June 24, 2011 7:54:42 PM

The current SB overclocks differently than anything else. Bclk is stock at 100 and can be changed to up to 105 but in most cases causes corruption when changed. So to get to 4.5ghz, all you do is change the multiplier to 45, maybe adjust the voltage and that's it. Ram could be 1333, 1600, 2133 it doesn't matter, since fsb is unchanged to OC.

SBE will go back to the normal way of OC, or so I heard, which is affected by ram. I am assuming what you read was about normal OC and not how SB OC.
a c 347 } Memory
June 24, 2011 8:18:12 PM

k1114 said:
SBE will go back to the normal way of OC, or so I heard, which is affected by ram. I am assuming what you read was about normal OC and not how SB OC.

That would be great, but where did you hear/see that?!

edit: I run a 980X and still use BCLK + Multiplier OC, you get a better OC.
a b } Memory
June 24, 2011 9:08:21 PM

Don't know exactly so I just googled real quick and came across this. http://www.xbitlabs.com/news/cpu/display/20110209222557... There doesn't seem to be much more info since SB came out but there are pics of x79 engineering samples from computex. http://www.bit-tech.net/hardware/motherboards/2011/06/0... I see pcie 3.0 printed on the mobos. :whistle: 

Now I feel bad for hijacking the thread so I will post something somewhat relevant. I've Asrock z68 pro3 with gskill 2x4gb 1600 cl8 F3-12800CL8D-8GBXM. Currently on sale. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
a c 347 } Memory
June 24, 2011 9:22:11 PM

I've seen it both ways, I've seen 6 & 8 cores, then 4, 6 & 8 cores, lately it's down to only 6 cores. The tech article last month that I read indicted the no 'DMI' 'BCLK', but I've seen so many conflicting articles -- at this point I'm just waiting for Intel docs.

Like the PCIe v3, I've seen both PCIe 2 and PCIe 3. Wiki had PCIe 3 on the LGA 2011 but the Z79 {from the X68} shows PCIe 2. The only consistent thing is the Quad-Channel, one would assume 2011 pins added some benefits, and 32-lanes of PCIe for the GPU.
June 25, 2011 7:46:29 AM

geofelt said:
On earlier cpu's the FSB(front side bus) was the clock for everything. If you increased it, you got your oc, but it also changed the ram speeds.
On sandy bridge, you just change the multiplier.
It is possible to increase the BCLK perhaps 3%, but that does not seem like much worth it.


k1114 said:
The current SB overclocks differently than anything else. Bclk is stock at 100 and can be changed to up to 105 but in most cases causes corruption when changed. So to get to 4.5ghz, all you do is change the multiplier to 45, maybe adjust the voltage and that's it. Ram could be 1333, 1600, 2133 it doesn't matter, since fsb is unchanged to OC.

SBE will go back to the normal way of OC, or so I heard, which is affected by ram. I am assuming what you read was about normal OC and not how SB OC.


Thx for explanation guys, ill change my 4gb kingston hyperx t1(2000mhz) to 8 gb kingston hyperxx t1 (1600mhz) then
June 25, 2011 8:11:07 AM

Does intel xmp matter, 4g hyperx has it, and 8gb hyperx does not, what is better?
a c 347 } Memory
June 25, 2011 1:33:24 PM

If you OC or are using 4 or more sticks I recommend that you set the RAM Manually and not use XMP.
a c 347 } Memory
June 25, 2011 1:40:33 PM

RRoller said:
1. I heard that asrock p67 fatality professional mobos are very ram brand specific?! a lot of people would advise me to use kingston hyperx. Heard there were issues with corsair dominator.
2. Which ram mhz should i choose, to overcloack my processor safely (oc will be 4ghz-4,5ghz probably)? i read on other forums that i should be buying no less than 1866 mhz ram.
3. And what would be the adequate amount of GBs of RAM for a gaming pc?

ANS 1 - Not true.
ANS 2 - Gaming 1600 CAS 8, I like the Ripjaws X or Corsair
8GB 2x4GB 1600 CAS 8-8-8-24-2T @ 1.5v F3-12800CL8D-8GBXM - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
8GB 2x4GB 1600 CAS 8-8-8-24-2T @ 1.5v CMZ8GX3M2A1600C8 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
ANS 3 - 8GB ; article -> http://www.tomshardware.com/reviews/ram-memory-upgrade,...
!