nForce 750i SLI

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xzanos

Weaksauce
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Jul 5, 2008
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ok so i recently purchased a new mobo. The nForce 750i SLI. and a new processor c2d. in the users manual of the mobo it says that all bios cpu features are only avalible to pentium processors. im i understanding that i will not be able to oc my c2d processor? i have been working with computers for many many years now but i have never had one of my own to oc so im new to the scene. all input would be helpfull
 
What brand and model of board did you purchase? "nForce 750i SLI' narrows it down to about 40 different motherboards.

Anyway ignore that line in the manual, it's probably a misprint or cut and paste job from an older P4 motherboard manual. With the 750i you will most assuredly have overclocking options for your Core 2 Duo in the BIOS. The only exception to this rule would be if it was some really cheap crippled ECS or PC Chips brand motherboard....

You should be fine.
 
I've had no problem oc'ing an E8400 to 4ghz with my 750i. You shouldn't have any problem oc'ing either.
 
Trust me, you can certainly overclock a Core 2 Duo on an EVGA 750i SLI FTW Edition motherboard.

I'm assuming by your statement about the motherboard being an EVGA board that it is an EVGA 750i SLI FTW Edition motherboard.
 
Dan D yes that is the mobo that im talking about so i am finaly sure i can oc my cpu on it.

"I've had no problem oc'ing an E8400 to 4ghz with my 750i."
did you have to change the voltage the get to 4ghz? i have heard that 3.8ghz can be goten with the standard voltage so was g/w
 
xzanos said:
Dan D yes that is the mobo that im talking about so i am finaly sure i can oc my cpu on it.

"I've had no problem oc'ing an E8400 to 4ghz with my 750i."
did you have to change the voltage the get to 4ghz? i have heard that 3.8ghz can be goten with the standard voltage so was g/w
Click to expand...

On that your mileage will always vary. You never really know until you try. Some CPUs overclock well on stock voltages and some do not.
 
thanks guys you have all been great.
i know i keep asking questions but here's another on. so how come when you look at cpu specs it says fsb 1333 but i hear ppl talking about the fsb of the e8400 being 500? and also what exactly is cpu-z
 
thanks guys you have all been great.
i know i keep asking questions but here's another on. so how come when you look at cpu specs it says fsb 1333 but i hear ppl talking about the fsb of the e8400 being 500? and also what exactly is cpu-z
 
xzanos said:
thanks guys you have all been great.
i know i keep asking questions but here's another on. so how come when you look at cpu specs it says fsb 1333 but i hear ppl talking about the fsb of the e8400 being 500? and also what exactly is cpu-z
Click to expand...

The 1333MHz FSB you hear about is a marketing scheme concocted by Intel. The truth is the bus speed is actually 333.3MHz. Intel's marketing team came up with the term "Quad Pumped Front Side Bus." It is also referred to as a Quad Data Rate Bus or QDR bus. Basically its' somewhat like DDR vs. SDRAM in that data is transfered throught he bus at an extremely high rate. Instead of the data being transmitted on the rising and falling edge of the clock cycle at an effective double data rate (which is how DDR RAM works compared to SDRAM) Intel forces 4x the amount of data throught he bus giving it an effective bus speed of 1333MHz. Or so that's what the marketing people say.

So to figure out the FSB you take the bus speed and multiply it times 4 and that's the bus speed the chip uses. So 333x4=1333. 400MHz x4=1600MHz. So a 533MHz FSB would yield an effective bus speed of 2132MHz. :eek:

All CPU-Z is used for is reading the CPU data and checking the clock speeds, and other values reported by the CPU. It also can read motherboard DMI/BIOS information as well as SPD/EPP values of the memory modules.
 
ok cool.
correct me if i am wrong but it is pointless to bump your cpu's bus higher than the mobo's fsb right? and if you are going to do so you should bump up the fsb of the mobo to match. but then you have to be careful because that can through off the speed of your ram and gfx cards correct?
 
xzanos said:
ok cool.
correct me if i am wrong but it is pointless to bump your cpu's bus higher than the mobo's fsb right? and if you are going to do so you should bump up the fsb of the mobo to match. but then you have to be careful because that can through off the speed of your ram and gfx cards correct?
Click to expand...

The motherboard and CPU front side busses are one and the same. If you set the motherboard FSB to 532MHz then your CPU runs at that bus speed. However you multiply that number by four to get the actual FSB rating for the CPU. On Intel processor compatible motherboards the CPU FSB and memory bus aren't necessarily linked nor do they have to be. A 1:1 ratio is ideal, but that's not always possible. Dividers are used when it can't be done. Since the memory controller isn't integrated into the CPU you can use a variety of combinations to achieve the highest processor overclocks. Many people actually use regular PC-2 6400 (DDR2 800MHz) modules with their Core 2 Duo and Core 2 Quad processors since it won't actually hinder their overclocking results. As for the graphics cards, they aren't effected because the PCI-Express bus frequency is locked to 100MHz unless you go in and change the settings for it. So you can set your FSB and memory bus to any supported frequency and it won't effect the PCI-Express bus or PCI bus settings at all.
 
ok so on the mobo specs it says that it supports fsb of 1066 and 1333 is that the only fsb you can use or can you oc beyond those and that is just the stock settings that the mobo comes with. also my mobo says it only supports up to 800 bus ram can you oc it to support like 1333 or 1066 and such?
 
It's only officially rated at that. You can oc past it with no problem (to a certain extent of course). The ram is fine too. I bought a set of 1066, but run my ram at 890 for a 1:1 ratio with my cpu..

Copy pasta from another member.
Formulas for Intel platform @ 1:1 settings: (base FSB speed is SDR, or single data rate)
c × [Base FSB speed] = CPU Clock speed (c = CPU Multiplier)
2 × [Base FSB speed] = RAM speed (DDR: double data rate)
4 × [Base FSB speed] = Effective FSB speed (QDR: quad data rate)

On Intel platforms, running the RAM higher than a 1:1 ratio with the CPU is, for the most part, useless, so don't bother trying to do so. If the BIOS/EPP does it for you, just let it. All you need is a 1:1 config, though. Here's some possible clock speeds (as always with OC'ing, your results will vary):

E8400: 9 × 333 = 3.0Ghz, DDR2-667 << STOCK
E8400: 9 × 400 = 3.6Ghz, DDR2-800 << Nice OC
E8400: 9 × 445 = 4.0Ghz, DDR2-890 << Good OC
E8400: 9 × 500 = 4.5Ghz, DDR2-1000 << Great OC
E8400: 9 × 533 = 4.8Ghz, DDR2-1066 << Nearly Impossible?
End copy pasta
You can of course use a lower multiplier and a higher bus (8x500=4ghz vs 9x445), but it wouldn't really make a difference in performance. To answer your question earlier, I had to start bumping up the voltage past 3.7. I'm running 4.0 at the moment at 1.40v but like Dan said, your mileage will vary. You might have a chip that will need to start bumping it up at 3.5 or you might get a bit closer to 4. You'll just have to toy with it and find out.
 
The eVGA 750i FTW is a good overclocking board, and the Auto settings work really well so newbies should get at least a decent clock out of it. Mine is running great with a mild overclock (Q9300@400*7.5 1.32v), and 8GB running at DDR1000 (1.21v). I have had it to 450 fsb, but I don't like overvolting that much, until I plan to replace the components anyway :)
 
dude thanks all!
i have been on this forum for like 3 days and all have been a great help
i finaly ordered the rest of my stuff today

i got 2 8800's and im looking for some new coolers for it. i have seen some on newegg and tigerdirect but they all seem like they would be blowing air right into the other card and not out of the case. any ideas?
 
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