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Quad or Dual?
- Thread starter aries2580
- Start date
[timko];14450336 said:It's the fsb that is quad pumped (450 x 4 = 1800) not the RAM. An fsb of 450Mhz with a default 1:1 divider results in an actual ram speed of 450Mhz (900mhz effective due to double data rate).
Your OCZ ram is rated to run at 1600Mhz effective double data rate @ CL7, which means its actual ram speed is 800Mhz. The 1800mhz CL9 you refer to is an actual speed of 900mhz.
The Q6600 you have now has an fsb of 266mhz. If you haven't overclocked your current Q6600 and you are using a 1:1 divider with your OCZ ram then you would currently be running the ram at an actual speed of 266mhz. As such, using the same divider and pushing the fsb to 450mhz also results in 450mhz actual ram speed, still well below 800Mhz CL7 and 900mhz CL9.
Even if you was to use the next available higher divider of 4:5 your ram would still only be running at an actual speed of 563mhz. Here's a list of dividers used with 450mhz fsb; and the resulting actual ram speed and effective in brackets:
FSB of 450Mhz and different dividers
1:1 = 450mhz (900mhz)
4:5 = 563mhz (1126mhz)
2:3 = 675mhz (1350mhz)
3:5 = 750mhz (1500mhz)
1:2 = 900mhz (1800mhz)
As you can see, you're not going to hit 900mhz unless you use the high 1:2 divider with 450mhz fsb.
Most bioses won't use 1:1, 4:5 labels for dividers and will instead use multipliers (2x, 2.4x etc) or they will just show the resulting actual or effective ram speed as you cycle through the options.
If you want to quickly see what divider you are currently on then just download CPU-z, run it and goto the "Memory" tab.
Hope this helps clear things up a bit
So at the minute I have my ram sitting at 800MHz (1600MHz) @CL7
CPU FSB - 400MHz
CPU multiplier - x8
Ram divider - 1:2
This could be a problem, because as you said using the other dividers
I will not reach the rated 800MHz (1600MHz)
and I don't fancy the latency involved with the 900MHz(1800MHz)
![[timko]](/styles/overclockers/avatars/5.png){kind=avatar}
The dividers I listed is not a complete list. Some motherboards will have more and some will have less. You will have to check your bios to see if yours has more options, preferably one between these two...
3:5 = 750mhz (1500mhz)
1:2 = 900mhz (1800mhz)
Remember what I said before about bios labelling of dividers, they most likely won't appears as above, more likely as multipliers or actual/effective ram speed.
A quick way to check what other dividers are available to you is this: Go into the bios and set the FSB to 450, don't save and quit just stay in the bios and look for the section where the divider options are kept. Then simply scroll down through the options and pick out any speeds/dividers I've not listed before and post them here. Then quit the bios *without* saving!
What's your current q6600 clocked at,? if at a decent speed, ie 3.4-3.6ghz, stick with it, as your on an x48 bard you might not get much of an oc from a new quad, the q9*** range tend to clock better on the newer p45 chipset boards.
See this...
Which means 3.2Ghz
aries2580, just like you've already overclocked your Q6600 beyond advertised speeds (either with or without extra voltage beyond stock) then you can do the same with your RAM. You can overclock your RAM and, if it's good enough, probably be able to run 900mhz (1800mhz) at tighter than CL9 with a small voltage increase.
Go into the Memory forum here at OCuk and do a search for the memory you have to see any threads on people overclocking it. If you can't find anything there then try a search at XS memory forum -> http://www.xtremesystems.org/forums/forumdisplay.php?f=164
Once you've seen how much you can push your RAM then it will be time to start seeing if your X48 mobo can handle 450fsb. You will want to lower the multiplier on your CPU and also lower the divider on your RAM before tsting 450Mhz FSB. This is because it will be the first time you've pushed the mobo this high and if you are also simultaneously pushing the CPU to a higher than previous overclock and the same for the RAM then you won't know what the problem is when it fails during stability tests.
Try and get this stable...
CPU FSB: 450Mhz
CPU Multiplier: 7x
Ram divider: 1:1
This results in only 3.15Ghz and the ram running at 450Mhz. The CPU is lower than 3.2Ghz so that won't be the problem if something fails. The RAM is also running well below your previous speed of 800Mhz so that won't be the problem if stability testing fails either. You're going to have to increase a few mobo related voltages (VTT/FSBt etc) to get 450Mhz FSB stable.
Once you get that stable, you can then increase the memory divider and try and run 900Mhz at tighter than CL9 timings with the kind of voltages you've in thread results for overclocking your memory here at OCuk or XS.
Why are you selling a Q6600 for a Intel Core 2 Quad Q9650 ?
You do know that the yorkfields offer around 200mhz clock for clock over the kentsfields?
Your upgrade is pointless and a waste of money.
I have clocked many Q6600's and not one of them has failed to be prime stable at 3.6ghz.
I ran mine at 3.8ghz 24/7
If you must upgrade then core i7.
As getting a Intel Core 2 Quad Q9650 is a pointless upgrade over a Q6600 on every level.
Was just about to say the same.
There is absolutely no point of upgrading from Q6600 to Q9xxx range.
Just stick with what you got !
The reason I was planning this upgrade was that I cannot get my system IBT stable a notch over 3.2GHz and the voltage required to get it stable brings my processor to 80 degrees!!!
My goal would have been 4GHz with the Q9650
@easyrider
I don't think I said this.
The only other option I can see is to replace my OCZ Vendetta 2 with something else. Grab some AS5 and do as [timko] said, and try for my max stable fsb with the Q6600.
But even then I'm even less than 3.2GHz if I try that.
Am I mistaken that games would respond to a higher clock frequency rather than the 450MHz?
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Especially in winter where your CPU stops heating your room
My room is eternally cold. I got wooden floors put in... In the summer its nice cause the wood sucks away all the heat, but in winter.... It's uninhabitable lol
I'd give you some plus rep if that is possible?
Something similar is found by clicking on the "Trust" button on the bottom of my posts
What hsf are you using? What is your IBT max temp? Lapped?
Off Topic:
"OcUK Forum member in Questions for Trust Rating Scandal!"
Thats a new one [timko], I can see the headlines now . .[timko];14460362 said:Something similar is found by clicking on the "Trust" button on the bottom of my posts
"OcUK Forum member in Questions for Trust Rating Scandal!"
Why are you messing about with a 7x multi?
A q6600 has a 9x multi
9x400mhz = 3.6ghz
all Q6600 will do this