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P4 630/DDR2 Question

post #1 of 8
Thread Starter 
Afternoon all.

Been reading through some of the guides (nice btw thank you for the time it must of taken to write).

Im running my P4 630, 800FSB (Real rate of 200?) as standard with an Artic Freezer 7 Pro Cooler

Ive also got 2X1 Gb Matched pair of corsair DDR2 XMS2 6400 (800Mhz).
5-5-5-5-12

CPU is idle at 24C and Load its 38C at the moment. (Seemed pretty dam good compared to the stock cooler?)

Enermax Noisetaker 600W 701AX

According to ABIT the max settings for the Mboard would be overclocking to Dual DDR2 1000

Does this mean im actually not utilising the speed of the RAM fully due to this CPU being the limiting factor? or is it that ive just got more headroom to push the CPU without the ram being a limiting factor?

Any help would be greatly appreciated.

Frostbyte
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P4 3.0Ghz S775 630 Abit AW8-Max 3rd Eye II WinXP Home Noisetaker 701AX (600w) 
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Thermalake Tsunami 
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post #2 of 8
Yes your Intel CPU is running at an effective clock of 200MHz. But since it's quad pumped (sends 4 instructions per clock cycle) then it's advertised as 800MHz.
Your DDR2 ram runs at an effective clock cycle of 400MHz (800/2 since it's DDR technology).

Quote:
Does this mean im actually not utilising the speed of the RAM fully due to this CPU being the limiting factor? or is it that ive just got more headroom to push the CPU without the ram being a limiting factor?
A more appropriate way to put it would be "you are not utilising the full bandwith of your ram".
Simply put, yes your ram has a lot of headroom should you decide to overclock your cpu by increasing the FSB.
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post #3 of 8
Just to clear up any confusion, the RAM runs at 400 MHz at stock speeds because it's the external clock speed of the system of 200 MHz x 2 (assuming a 1:1 ratio). On it's own, the RAM stock speed is 800 MHz or a clock speed of 400 MHz as was written above.

There are two ways to look at the higher speed RAM. The first, as suggested above, is that you have tons of headroom for overclocking. As you bump the clock speed of the system, you up both the processor and the RAM (and other things if they're not locked). You'll have to overclock a very long way to push that RAM (literally a 100% overclock).

The other option is to run a divider so that the RAM runs faster than the CPU. There are two common ways to do this in the BIOS. Some BIOSes are explicit about dividers. Those show CPU:RAM, so 4:5 means the RAM is running 25% faster than the CPU. In your case, you could run a 1:2 in theory. The other common way is to select the speed of the RAM. That will show in the BIOS as DDR2-800 along with similar options.

Intel systems love bandwidth, though running a divider doesn't always help performance. My suggestion would be to overclock your system as far as is possible at 1:1 and then try running dividers to squeeze a bit extra out of your RAM. Benchmark your system with and without a divider and see which works out better for you.
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post #4 of 8
Quote:
Just to clear up any confusion, the RAM runs at 400 MHz at stock speeds because it's the external clock speed of the system of 200 MHz x 2 (assuming a 1:1 ratio).
Thanks for clarifying that . I hope I didn't confuse the guy when I said that the ram runs at an effective clock cycle of 400MHz.
Of course I was talking about the ram theoretically running on "it's own" (not on the limited FSB speed), as you nicely put it.
My System
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CPUMotherboardOSMonitor
P4 630 3.0GHz Asus P5LD2-VM Windows XP Pro (SP2) Viewsonic VX-724 (LCD) 
PowerCaseMouse
Antec TruePower II 480W TT SViking (modded) Logitech G5 +TT Gamma Pad 
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My System
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CPUMotherboardOSMonitor
P4 630 3.0GHz Asus P5LD2-VM Windows XP Pro (SP2) Viewsonic VX-724 (LCD) 
PowerCaseMouse
Antec TruePower II 480W TT SViking (modded) Logitech G5 +TT Gamma Pad 
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post #5 of 8
Thread Starter 
Thank you both for your input on this, I think i might be able to push this system a fair way, cpu is idling at 20C now, load <30, very happy with that for a prescott 630, if i had used artic silver 5 instead of the standard stuff it would be quite impressive!

One more question if i may, im running the uGuru clock with my AW8-Max that lets me adjust the Fsb within windows.

Can i do this & just run benchmarks or should i do it from bios, and if it loads windows that is an effective benchmark?

Regards,

Frostbyte
My System
(13 items)
 
  
CPUMotherboardOSPower
P4 3.0Ghz S775 630 Abit AW8-Max 3rd Eye II WinXP Home Noisetaker 701AX (600w) 
Case
Thermalake Tsunami 
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My System
(13 items)
 
  
CPUMotherboardOSPower
P4 3.0Ghz S775 630 Abit AW8-Max 3rd Eye II WinXP Home Noisetaker 701AX (600w) 
Case
Thermalake Tsunami 
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post #6 of 8
There's no harm in adjusting the settings from Windows. I've never had an Abit mobo so I don't know how it works.
I can imagine it's similar to the AI Booster offered by Asus.
Anyway having a system that loads windows is not a sign of stability.
You need to stress the sytem with programs like Prime95 and SuperPI. There are excellent FAQs on this forum on how to do that.
You said your temps are 20 idle and <30 load ?? What is your room temperature because, frankly, those are excellent temperatures for a Prescott !
My System
(13 items)
 
  
CPUMotherboardOSMonitor
P4 630 3.0GHz Asus P5LD2-VM Windows XP Pro (SP2) Viewsonic VX-724 (LCD) 
PowerCaseMouse
Antec TruePower II 480W TT SViking (modded) Logitech G5 +TT Gamma Pad 
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My System
(13 items)
 
  
CPUMotherboardOSMonitor
P4 630 3.0GHz Asus P5LD2-VM Windows XP Pro (SP2) Viewsonic VX-724 (LCD) 
PowerCaseMouse
Antec TruePower II 480W TT SViking (modded) Logitech G5 +TT Gamma Pad 
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post #7 of 8
Frostbyte, it is ok to set overclocks within windows to test them out but if you plan to keep your computer at those speeds then just set it to whatever you set it to in software in your BIOS. For instance, say you tested up to 257FSB in the program and it is totally stable, then go into BIOS and set your FSB to about 250 and test then 255 and finally 257 (gradual increases are always best, even if you already know the max) Have fun and good luck!
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post #8 of 8
Thread Starter 
Room temp reported by the Uguru is 23C, its idle at 24.

The room temp this morning was 19, the cpu was idling at 21 or so and full load at 29.

I had appauling temps with the stock fan, around 70C was worst it got to.

Cleaned it up and put the arctic freezer7 pro on, with the supplied thermal compound & its literally halved in temp.
My System
(13 items)
 
  
CPUMotherboardOSPower
P4 3.0Ghz S775 630 Abit AW8-Max 3rd Eye II WinXP Home Noisetaker 701AX (600w) 
Case
Thermalake Tsunami 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardOSPower
P4 3.0Ghz S775 630 Abit AW8-Max 3rd Eye II WinXP Home Noisetaker 701AX (600w) 
Case
Thermalake Tsunami 
  hide details  
Reply
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