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Can you explain OC'ing a CPU vs OC'ing a graphics card (in terms of performance increase)

post #1 of 12
Thread Starter 
Hello, I'm in the middle of OC'ing my old PC since I have a new one now. It will be good practice, less to lose, not concerned about downtime, etc.

While reading threads here I noticed people that have OC'd my CPU (QX6700) commonly took it from 2.66ghz to 3.2ghz and sometimes higher.

My graphics card is the Geforce 8800 GTX and I see people over clock it significantly less (as a percentage of the original setting. They were talking about changing it from 575 to 620.

Are the increases in performance directly related to these settings (if you increase the CPU 30% do you see a real world 30% performance increase)?

If that is the case it made me wonder if in old systems it makes more sense to OC the cpu but look for a cheap new graphics card to go with it. Please let me know your thoughts!!!


P.S. I am buying new memory for it anyway (yes I realize its probably not worth it but this is an experiment and I want it to be somewhat usable when I'm done so I'm upgrading from 4GB to 8GB of memory) so I'm sure I'll be able to get whatever speed is required for the CPU.
post #2 of 12
ok,

So depending on the motherboard you have you can unlink your memory from your FSB which will make it easier.

Secondly, even if you overclock the GPU from 575 to 620 or something, it's actually quite a sizable increase. You're always better off overclocking the GPU for more FPS unless your CPU is bottlenecking.

Essentially though, it's best to just overclock both

Comps
post #3 of 12
Thread Starter 
Thank you for the replay Compuman.

I have this mobo:
http://www.newegg.com/Product/Product.aspx?Item=13-188-009&SortField=0&SummaryType=0&Pagesize=10&PurchaseMark=&SelectedRating=-1&VideoOnlyMark=False&VendorMark=&IsFeedbackTab=true&Keywords=qx6700&Page=1#scrollFullInfo

In that link the reviews are displayed are only the ones that include "qx6700" in them because that is my chip. The big problem I'm having as a noob is described in those reviews. There is a specific conflict between this chip and that motherboard when overclocking. Its making it much harder to learn this for the first time.

I thought the ram and CPU had to be set to matching bus speeds for the PC to operate smoothly? Because this is a test and yet I want the PC to server a purpose after I'm done (If I don't cook it) I don't mind spending some money on it to learn. I currently have 4 dimms 1GB each and the board only has 4 slots on it. I want more ram. If I need to buy a used MOBO on ebay to get around this CPU/mobo conflict and it also gives me more dimm slots then that might be a good idea depending on the price.

I've already bought an SSD for this machine and although I haven't done it yet I'm guessing I'll have to buy a pci card with SATA iii ports on it to fully utilize it (this old board of course doesnt have sata iii).


I bumped an old thread this morning no one has responded since: http://www.overclock.net/t/237252/evga-680i-a1-qx6700-overclocking-thread#post_18717924

Can you suggest any of those mobos? I do have a video card that supports SLI but I do not intend to use 2 cards. In that thread I was not sure if they were saying you must have one of the mobos that is bad for OC'ing if your video card supports SLI - or only if you intend to use 2.

much much much thanks!
post #4 of 12
Hey man,

Ok a lot to take in, i'll do my best since i'm on the train home. The 680i is a good board, great chipset, You can unlink the FSB from the DRAM strap.

The CPU and RAM speeds don't need to be the same speed, what' your'e looking for is a 1:1 contention ratio, meaning the memory and the FSB are at the same speeds and ensuring there is no bottleneck.

So, if you set your FSB to 400, your memory to 400 and a ratio of 1:1 you're golden, your CPU multiplier would need to 9 which would give you a 3.6GHZ overclock and a smooth running machine.

In addition to this, what cooling do you have? These things get HOT!

Comps
post #5 of 12
Thread Starter 
First of all I have to say thank you very much. I generally try to read about something forever and answer my own questions because people in forums often just toss out alternatives that don't fit the criteria but I knew I wasn't going to be able to do this alone and hit a homerun the first time. Thanks agian!


In the newegg link I provided with the sorted reviews (only people with my CPU and the conflict between it and the board) 3 of them state their FSB limit, one says 1300 and 2 more say 300 and claim it is widely reported on the internet (that is multiplied by 4 and would be 1200 compared to the other guy's 1300, correct?). They say they only achieve 3.2ghz for this reason.

I know people don't normally dump money in their old machine but this was a test for me and I have already spent some, it sound like I need to spend a little more and get a mobo that does not have this conflict. One guy in the newegg review says EVGA fixed the conflict and rereleased the board as 122-CK-NF68-BR PCB-180-7R093-0000-D00. Rather than looking for that exact board I thought I would post for help. As old as these boards are I didn't know what would be available on Ebay and if any of the other options on ebay could meet my overclocking needs and provide more dimm slots or faster SATA.

thanks!
post #6 of 12
Quote:
Originally Posted by Dan35708 View Post

Are the increases in performance directly related to these settings (if you increase the CPU 30% do you see a real world 30% performance increase)?

In CPU limited scenarios, very nearly.
Quote:
Originally Posted by Dan35708 View Post

If that is the case it made me wonder if in old systems it makes more sense to OC the cpu but look for a cheap new graphics card to go with it. Please let me know your thoughts!!!

Depends on what you are doing with it. In general, CPUs do OC more than GPUs, and games are more GPU limited. So, if you are gaming and don't have a uselessly weak CPU, a new GPU is probably the better investment.

A QX6700 is certainly dated at this point, but it should easily reach 3.2GHz+ and should be more that sufficient for most games.

The QX6700 is an unlocked part. You don't even need to change the FSB speed (though the right FSB increase can give a respectable performance boost) to over clock it.
Edited by Blameless - 11/30/12 at 10:47am
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post #7 of 12
Well to be honest, with a decent GPU and a nice overclock that would be an excellent little gamer machine to be honest. Everyone neglects their Q series processor even though it's 4 cores of awesomeness.

To be honest, I'd be happy with a little Q6600 again and an HD 7850. That would be the perfect balance of CPU and GPU.

I'd say if you threw something like $200 - $300 on this machine that wouldn't be a bad thing and even after that you've got a good working machine that I'd put around the $500 - $600 mark on somewhere like Ebay or craigslist. Bearing in mind this was stuff you had lying around thats a nice bit of profit right there.

Comps
post #8 of 12
Well to be honest, with a decent GPU and a nice overclock that would be an excellent little gamer machine to be honest. Everyone neglects their Q series processor even though it's 4 cores of awesomeness.

To be honest, I'd be happy with a little Q6600 again and an HD 7850. That would be the perfect balance of CPU and GPU.

I'd say if you threw something like $200 - $300 on this machine that wouldn't be a bad thing and even after that you've got a good working machine that I'd put around the $500 - $600 mark on somewhere like Ebay or craigslist. Bearing in mind this was stuff you had lying around thats a nice bit of profit right there.

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post #9 of 12
Thread Starter 
Because of the specific conflict between this chip and my mobo people are saying they can't overclock much at all and other can easily overclock to 3.4 or 3.6ghz. I saw one guy claiming he could OC to 4.4ghz with liquid cooling. I have no idea if that is true but I had not planned on paying for liquid cooling. What mobo should I get to replace mine? I prefer something used, cheap, and can use more than 8gb of ram.
post #10 of 12
You'll get the most performance out of OCing the CPU,RAM and GPU RAM.(in that order)
A GPU is capable of an enormous amount of throughput.Overclocking the CPU and RAM allows the GPU to breathe better.Lastly;OCing the GPU core brings some gains, too.
Edited by Schmuckley - 12/1/12 at 7:53am
 
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