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New OC'er! Help with 945 or E6400 rig!

post #1 of 11
Thread Starter 
hi all,

i am new here but have been reading forum for a few months. I am currently deciding on bits for a new rig i want to build. I have included the potential parts in my sig.

I am not interested in massive gaming performance as i have a 360 to play on but i do need a nice fast processor to chug its way through my experiments. I am a postgraduate with my main research interests being in natural computation (AI related) so i run a lot of A-life simulations etc

My main question is, compared to a E6400 how fast will an overclocked D 945 be?? To further explain. I was originally planning on buying a D 945 for £103 and overclocking it to around 4ghz which i think is achievable.

However, i have noticed that the E6400 is £57 more and will run on all of the same equipment i am thinking of getting. I see that this chip has less cache but a higher chip fsb (266) by default. If i overclocked a pentium D945 to 4ghz then i presume the chip fsb would be 235mhz. So which would be faster? the E6400 with higher fsb or the overclocked 945 with a higher (double!) clock speed.

You may wonder why i havent mentioned overclocking a E6400, my memory is 667mhz so i could only squeez another 66mhz out of the chip and stay on a 1:1 divder with the ram (total fsb 333mhz). is that right?? in which case i would need to spend more money on faster ram (which i dont really want to do...).

So can someone explain the differences between the two chips in terms of performance and just generally comment on the proposed rig.

thanks guys!!!


edd
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post #2 of 11
The E6400 should be your pick. It's faster than the Pentium D 945.

Here are some benchies, and yuo can see the E6400 outperforms the EX965 in many benchies, some of them by a wide margin. The EX965 runs at 3.73. Thus, an overclocked D945 (4.0GHz) will be a bit faster than the EX, but not that much.

I recommend the E6400. At an FSB of 333, it'll run 2.33GHz. Also, if the RAM is any decent it will allow for some overclocking, so an FSB of 350MHz (2.45GHz CPU clock) should be a reasonable goal.

Plus, this G.Skill RAM is about the same price as several DDR2 667 kits I saw:
G.Skill 2GB DDR2 NR PC2-6400 (2x1GB) CAS5 Dual Channel Kit (F2-6400PHU2-2GBNR) (MY-014-GS) £176.24 Including VAT at 17.5%
http://www.overclockers.co.uk/acatal...ll_Memory.html (fourth from top, green sticks)
    
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post #3 of 11
Welcome! Good luck
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post #4 of 11
Thread Starter 
Hi All, Thanks for the replies guys!


I have noticed that the E6300 is even less than the E6400 (didnt see it before)

i know this cpu runs at only 1.8 but have seen people over clocking it quite far. Is this still going to be a better choice than a 945?


Also, the E6300 / E6400 only have half of the cache of the 945's - doesnt this make them slower in any way???

thanks all,


edd
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post #5 of 11
Yeah, given the headroom in overclocking, the E6300 is still preferred.

The cache design is different. The D945 has 2MB cache per core, while the E6300 has 2MB cache combined, which can be utilized by either core. Thus, with purely single core application, the E6300 has access to nearly the full 2MB cache (Assuming the other core is nearly idle). However, under full load of both cores, there is only 1MB available per core.

The difference between the cache amounts will not be that great.

What is your total budget for a rig, and which parts do you need.
    
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post #6 of 11
I might add in that MHz isn't everything. Check this one
#well
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#well
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by Chozart
What is your total budget for a rig, and which parts do you need.
I am spending £700 max on the rig. I have edited my sig to show the parts that i am buying. What do you think about them?? With the updated corsair ram i figure i can aim for as close to 400fsb (max ram frequency) on the cpu as possible?

But the one thing that i am not sure of is the motherboards fsb. The P5B supports 1066mhz fsb which when scaled by four is a 266Mhz fsb on the processor. Does this mean as soon as i start overclocking the processor and go past 266mhz i am overclocking the motherboard aswell? Is there any chance that the P5B will go to 400mhz (1600mhz)?

I guess i always thought when you were overclocking a processor you were keeping within the limitations of the chipset clock speed. But i guess most overclocks push the board aswell??

apart from that, does the rest of my potential rig look ok??

Quote:
Originally Posted by gonX
I might add in that MHz isn't everything. Check this one
That's interesting, thanks for the link.

thanks,

edd
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post #8 of 11
In any case, you obviously exceed the default FSB of any motherboard. However, most motherboards are made to deal with this easily. High end motherboards, like the P5B Deluxe can hit up to 500MHz on the FSB.

Your choices look good. The only parts I would reconsider are the motherboard and the video card. I don't know the standard P5B overclocks (it should be good, but not sure). However, I do know the Gigabyte GA 965P-DS3 (£95.16 Inc VAT) and even the Gigabyte GA 965P-S3 (£86.69 Inc VAT) overclock very well.

The other part I'd look at again is the video card. The X8xx series are good and powerful cards, but lack sm3.0 support. How much can you get that card for?
    
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post #9 of 11
looking at the system in your sig i would personally get the P5B Deluxe instead of the standard, and get the g.skill NR ram that chozart suggested. I don't think you'll be able to hit 400mhz fsb with the plain P5B, so might as well spend less on the ram and more on a mobo that will allow you to hit the higher fsb. also the NR can handle a slight overclock to 900mhz or so.
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post #10 of 11
Thread Starter 
Hey guys,

thanks for the advice. apreciate it :-)

i am going to stick with the mobo i think as i dont need the bells and whistles that the delux model offers (wifi sli/crossfire/ extra bits etc).

The vanilla one will do me fine i hope - i have read elsewhere that with a bios update to 0509 the board allows you to set the fsb up to as high as 650mhz and on the stock bios 400mhz should be achievable.

there is a link here with more infohttp://forums.bit-tech.net/showthread.php?t=120993

I am keeping the x850 xt i think (£94) for two reasons, one: i dont really play games on a pc (have 360) so dont need high end graphics. 2. It comes double pci slotted (with the fan etc to take air out the back) which appeals to me when i wanna keep the heat down.

I was considering the 7600GT which does include sm3 but i dont see the point of worrying about some shading when i am not going to be playing games on it!!! Also, it doesnt include a double pci bracket so if i wanted one fitting that would be £12ish; the card is already £12 more than the ati so i would be paying £24 for SM3... not that bothered about it! however if anyone can think of a reason why i should choose the 7600GT over the x850XT please feel free to say so!

I am getting the Corsair XMS2 as i was told it is exellent ram - i havent heard of this G Skill really. is it better? ot just cheaper

edd
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My System
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Pentium Core Duo E6300 Asus P5B (Standard) Ati Radeon x850 XT Corsair xms2 800Mhz 2gb 
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Western Digital 250GB FC Linux / XP MCE 2005 Acer 19" widescreen Logitech Black Ultra-Flat 
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