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Ati 7970 + i5 3570 Bottleneck? - Page 2

post #11 of 27
Quote:
Originally Posted by rss013 View Post

Is a OC to 4Ghz possible on a MSI B75MA-B45 ?

No. You can only change the multipliers on a Z77 chipset motherboard, H77 and B75 won't let you do it.
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post #12 of 27
Thread Starter 
Thanks for your answer:),
But will it be a big improvement if i switch the CPU to a 3570K and OC it to let's say 4,2ghz.
Would the higher clockspeed be much better for my GPU?
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post #13 of 27
Depends on the game. Skyrim, for instance, loves higher clockspeeds on my 2500k. But in most of them, you won't notice a thing.
post #14 of 27
Overclocking a non-K CPU is a bit risky. The frequency multiplier is locked, so any kind of overclocking has to be applied to the BCLK (base clock) of the CPU, which directly affects the FSB (front side bus) frequency. The problem with that is, you're essentially overclocking other parts of your system too, like PCI-E, SATA, etc. If overdone it can damage your motherboard/GPU/HDD/SSD and you don't want that.

A slight 0.2GHz could be achieved without any risk though. Here is how BCLK overclocking roughly works:

The BCLK on your 3570 is fixed to 100MHz. Multiply that with the 38x turbo multiplier and you have 3800MHz = 3.8GHz. By increasing the BCLK to 105MHz (5MHz increase) you will gain 5MHz x 38 = 190MHz = 0.19GHz, which will bring your 3570 to 3.99GHz.

I don't know if your CPU will accept that slight BCLK increase, but it shouldn't damage anything either, so you can try. You could just leave it as is though if you don't like taking risks, because such an increase is negligible.

EDIT: One way or another, you HAVE TO make sure that the motherboard you'll pick supports the turbo technology for Intel CPUs. Otherwise you won't reach 3.8GHz ever.
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post #15 of 27
Thread Starter 
Thanks that was a very clean explenation, But i take this parts for example: ASRock z77 Pro 3 + Intel i5 3570K.
With that mobo+cpu, a oc to 4,2 GHZ won't give any big performance to the 7970?
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post #16 of 27
With that motherboard-CPU combo you could OC easily up to 4.5GHz with a half-decent 30€ cooler.

The whole CPU bottlenecking the GPU concept is totally dependent to the game in question. Assuming you're going to be using VSync for smooth gameplay, that OC won't make a change. However If you where to get a 120Hz monitor to use with that computer, that OC would help a lot. There are games where the GPU is bottlenecking the CPU and they are much more common. So either with or without OC you would be fine. Spending 50-100€ more to get a decent CPU overclock is better overall for your system though, and if you do that you could get a 9970 (for example) in the future without upgrading your CPU.
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post #17 of 27
Thread Starter 
Yeah well that is exactly what i got atm.
Im using now: Samsung 2233RZ LCD Dual-DVI 120HZ With V-sync off(Because it gives a fps boost at CS:GO). In combination with Intel Q8400 Quad + Nvidia GTX 550 Ti.
I know the new rig is going to be a big performance boost at all. But i was just wondering about that Gpu+ Cpu OC'ing part, wich i was not sure about if it would affect performance.
Games i play often are : CS:GO,BF3,COD Black ops 2.
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post #18 of 27
no. an i5 3570 @ stock is still a beast
post #19 of 27
Counter Strike and CoD games are really light on the CPU side of things. BF3 however could use some CPU OC'ing since you're at 120Hz. I would pick the 3570K and a mobo that OC's (ASRock isn't bad) along with a cheap air cooler, then OC that thing to 4.5GHz.

Just to let you know, a single 7970 won't be able to push 120FPS stable in BF3 maxed out, but would indeed score close to 100FPS at that resolution. With some settings tweaking you could score 120FPS easily, and even use VSync. To hold it steady though you would need some CPU OC.
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post #20 of 27
Thread Starter 
Thanks all, as far for know things are clear for me smile.gif. gonna get the asrock mobo + 3570k.
One thing i am still confused about is to maybe replace the 7970 for a gtx 670, as the prices here in Netherlands are the same. 7970= 350,- so is the 670.
I am not planning to run multiple monitors or something in the future, so for single monitor performance, what would be my best shot to go for?
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Ivy
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