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1:1

post #1 of 10
Thread Starter 
I read the stickies, but I am still not understanding 1:1. I started to get confused when he said that at 800mhz fsb you only suppory ddr400 but then he later went on to say that 240 fsb supports ddr400. What is the deal??

Here is what I know:
I have an amd x2 4200+ (getting and e6600 conroe soon, can't wait!!)
Is fsb going to be the thing at 1066mhz or the 200? I always thought it was fsb*multiplier=clock speed. In this case, 200fsb*11=2.2ghz. So is the 1066mhz my HTT frequency? What is the difference?

While I'm here I want to know what some good RAM is for a 6600 c2d that I'd like to push to around ~3.0ghz. The mobo I was thinking of getting was the Asus P5B (http://www.newegg.com/Product/Produc...2E16813131028). How's the quality on this board when it comes to OCing? Will it work with a c2d out-of-box? The RAM I looked at was CORSAIR XMS2 2x1GB PC2 6400 (http://www.newegg.com/Product/Produc...2E16820145590). However, that RAM is a bit pricey. I would like to keep my RAM budget around $200 or $250. I really appreciate your help!
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post #2 of 10
Ok... couple of basic things here:

For AMD socket 939, the external frequency of the CPU is 200MHz. A multiplier of 11 indeed results in an CPU frequency of 2.2GHz. DDR400 RAM runs also at an external frequency of 200MHz, which results in a 200:200 or 1:1 ratio between RAM and CPU (this is the famous 1:1 divider). Now, when you set RAM in your BIOS at DDR400 (or 200 external), the effective RAM frequence will go up together with the CPU frequency. Thus, when your CPU external frequency is 240MHz (CPU clock speed 11x24 = 2.64GHz), your RAM will also run at 240MHz, or DDR480 speeds. Whether your RAM can handle that, depends on the quality of the RAM.

Now, with Intel chips, an FSB of 800MHz, or for Core 2 Duo 1,066 MHz, is often used. However, this FSB of 800MHz still translates into an external frequency of 200MHz on the motherboard, since Intel CPUs are so-called 'quad pumped'. Same goes for the 1,066MHz FSB, which translates into an external frequency of 266MHz. Now, for the FSB of 800MHz (external frequency 200MHz), the exact same applies as my explanation for the AMD above. Thus, stock DDR400 RAM is 1:1 with CPU, and RAM speed goes up with the CPU speed, as long the RAM can handle it.

With Core 2 Duo, we're looking at DDR2. For DDR2, the external frequency is also half the DDR2 frequency, thus DDR2 800 runs ate 400MHz external. Since the external frequency of Core 2 Duo is 266MHz, the 'matching RAM is DDR2 533. This will run on 1:1 with the CPU. However, the Core 2 Duo reaches such insanely high overclocks that DDR2 800 is highly recommended. In my case, I run my E6600 at 3.51GHz, or an external frequency of 390MHz (390x9 = 3,510MHz). If I want my RAM at 1:1 at those speeds, I'll need RAM that can handle an external frequency of 390/266 * 266 = 390MHz, or DDR2 780 speeds. At even higher speeds, you'll exceed DDR2 800 speeds. (Good DDR2 800 should handle something like DDR2 1000 or so...depending on quality)

I think this G.Skill kit looks nice:
G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 800 (PC2 6400) $259.99
    
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post #3 of 10
Thread Starter 
Is there some chart where I can see the external speeds for DDR400, 433, 500, 544, etc. Or is there some quick formula for finding it out?
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post #4 of 10
Just divide by 2

DDR400 = 200MHz (that's why 1:1 with CPUs that run on 200MHz, like most socket 939 AMD CPUs and many Intels)
DDR2 533 = 266MHz (that's why 1:1 with CPUs that run on 266MGz, such as Core 2 Duo)
    
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post #5 of 10
Thread Starter 
What is a good mobo for a c2d that supports raid0 (thinking of getting a second wd1500) and can overclock well? It would also be nice if it worked with a c2d out-of-box and didn't need a BIOS update. It'd be cool if it supported crossfire as I might get a second x1900xtx, but that is just an added bonus, I wouldn't want to pay much extra or sacrifice other features for it.
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Core 2 Duo E6600 @ 3.3ghz Gigabyte EP45-UD3P r1.0 GeForce GX275 Corsair 4gb (4x1gb) TWIN2X2048-6400 Rev 5.1 ProMOS 
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post #6 of 10
This ASUS P5B-E Socket T (LGA 775) Intel P965 Express looks like a good board for a reasonable price ($157.99 + $6.41 shipping). It supports RAID on the southbridge, overclocks very well, but does not support Crossfire (only one PCI-E slot).

Since you have a 19" monitor, I don't think Crossfire will give you much benefit. Crossfire/SLI is mostly beneficial with higher resolutions (1600x1200 and higher, or widescreen equivalents). If you choose Crossfire, however, you will need to buy an X1900 Crossfire Edition card, and not an X1900XTX.

This ASUS P5B Deluxe Socket T (LGA 775) Intel P965 would support Crossfire, although in an x16, x4 mode. It is also substantially more expensive at $194.99 + $6.94 shipping. The better Crossfire boards are those based on the 975X chipset. The DFI INFINITY 975X Socket T (LGA 775) Intel 975X is a decent board for $179.99 + $6.41 shipping. It runs solid, but lacks the overclocking capabilities and performance of the P5B boards.

Finally, the best of both worlds is likely one of those two boards: ABIT AW9D-MAX Socket T (LGA 775) Intel 975X for $239.99 + $7.32 shipping or the ASUS P5W DH DELUXE/WIFI-AP Socket T (LGA 775) Intel 975X for $269.99 + $7.32 shipping. The Abit board only has one PCI slot, which is likely unuseable when you ruin Crossfire on it.

Ok, these are the best options. In your situation, I'd likely go with the first one I mentioned
    
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post #7 of 10
Thread Starter 
What do you think of this RAM? http://www.newegg.com/Product/Produc...82E16820145034

I work at Micro Center and I can get about $100 knocked off that because as a mass retailer, Micro Center will get it damn cheap.
Also, does the ASUS P5B-E Socket T (LGA 775) Intel P965 Express support EPP?
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post #8 of 10
That's the RAM I have, and it works fine for me

I think the 965 chipset does support it... not 100% sure. I do believe that ASUS does generally recommend Corsair.

Another good kit is this one:
http://www.newegg.com/Product/Produc...82E16820231065
About the same price as the Corsair, and similar specs. If no discount, then definately the Corsair, otherwise, close to a toss-up.
    
CPUMotherboardGraphicsRAM
E8400 @ 3.8 GHz DFI LANPARTY DK X38-T2R eVGA 8400GS 2GB Mushkin DDR2 800 (single stick) 
Hard DriveOptical DriveOSMonitor
250GB WD SATA None Windows XP Pro 32-bit HP Pavilion f1703 
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N/A Corsair HX520 Coolermaster Cavalier N/A 
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CPUMotherboardGraphicsRAM
E8400 @ 3.8 GHz DFI LANPARTY DK X38-T2R eVGA 8400GS 2GB Mushkin DDR2 800 (single stick) 
Hard DriveOptical DriveOSMonitor
250GB WD SATA None Windows XP Pro 32-bit HP Pavilion f1703 
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by Chozart
That's the RAM I have, and it works fine for me

I think the 965 chipset does support it... not 100% sure. I do believe that ASUS does generally recommend Corsair.

Another good kit is this one:
http://www.newegg.com/Product/Produc...82E16820231065
About the same price as the Corsair, and similar specs. If no discount, then definately the Corsair, otherwise, close to a toss-up.
Doesn't support that RAM or doesn't support EPP?
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CPUMotherboardGraphicsRAM
Core 2 Duo E6600 @ 3.3ghz Gigabyte EP45-UD3P r1.0 GeForce GX275 Corsair 4gb (4x1gb) TWIN2X2048-6400 Rev 5.1 ProMOS 
Hard DriveOptical DriveOSMonitor
150g Raptor, 2x 1TB Seagate 2x DVD Burners Windows Vista Home Premium 32bit 24" Samsung 245BW + 22" Samsung 225BW LCD 
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CPUMotherboardGraphicsRAM
Core 2 Duo E6600 @ 3.3ghz Gigabyte EP45-UD3P r1.0 GeForce GX275 Corsair 4gb (4x1gb) TWIN2X2048-6400 Rev 5.1 ProMOS 
Hard DriveOptical DriveOSMonitor
150g Raptor, 2x 1TB Seagate 2x DVD Burners Windows Vista Home Premium 32bit 24" Samsung 245BW + 22" Samsung 225BW LCD 
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post #10 of 10
The Asus will support that RAM. Corsair is recommended by Asus.

Not sure about EPP.
    
CPUMotherboardGraphicsRAM
E8400 @ 3.8 GHz DFI LANPARTY DK X38-T2R eVGA 8400GS 2GB Mushkin DDR2 800 (single stick) 
Hard DriveOptical DriveOSMonitor
250GB WD SATA None Windows XP Pro 32-bit HP Pavilion f1703 
KeyboardPowerCaseMouse
N/A Corsair HX520 Coolermaster Cavalier N/A 
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N/A 
  hide details  
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CPUMotherboardGraphicsRAM
E8400 @ 3.8 GHz DFI LANPARTY DK X38-T2R eVGA 8400GS 2GB Mushkin DDR2 800 (single stick) 
Hard DriveOptical DriveOSMonitor
250GB WD SATA None Windows XP Pro 32-bit HP Pavilion f1703 
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