AMD64 overclocking with 4 sticks of RAM

[neptunes]

Hi guys.

Does using 4 sticks of memory in an Athlon 64 s939 platform limits
the overclocking?

I remember way back there was something about 1T and 2T but
I don't know if that affects overclocking potential.

[STEvil]

use 2T on double sided/double ranked modules, will clock fine usually.

3200 chipset (RD580) might have issues with 4x sticks of ram though.. my CFX3200-DR cant pass 220fsb stable with 4x 512mb TCCD/E :(

[neptunes]

Thanks for response. I'll be using an A8R32-MVP :(

[Lastviking]

Dfi Venus (939) works fine with 4x512mb 2T 280mhz+ 2-2-2-X

[LIKMARK]

You have to use 2T, and probably you'll have to sacrifice some MHz to run 4 sticks.

[Shaz]

My friend OC's his Opteron 144 fine with 4 sticks of RAM.

[Sunfire]

Thanks for response. I'll be using an A8R32-MVP :(

I have the same motherboard with a 4200+ X2 (E6 half Toledo). If you install four dimms it will run at 2T, but the rams are also divided to 333 MHz. The funny thing is, if you set the rams to 216 the board boots with 433MHz. At 200 it boots with 333 :confused:
I wrote not long ago a few emails to the Asus support, and they said, that I have to lower the CPU multiplier, and raise the HT freq. I also wrote them that DFI has managed to enable the 1:1 ratio when using 4 double sided rams, but they said it is because CPUs have different memry controller.
But! The overclocking works (when rams set to 216) and standard mode (when rams set to 200) didn't? I think it's bs :shakes:

So it's not funny at all.

Sorry for my english...

[stealth]

Some guys believe that you can run four sticks or four gigs of Ram at DDR400 1T,by setting Tref,MAL,Read Preamble e.t.c. you may be able to slow down the Ram enough to make it run at 1T, i don't have four sticks to try but may is worth to give it a try.

http://forums.extremeoverclocking.com/showthread.php?t=170999

http://www.diy-street.com/forum/showpost.php?p=230464&postcount=1

http://www.diy-street.com/forum/showthread.php?t=11397

http://www.diy-street.com/forum/showpost.php?p=206833&postcount=7

http://forums.vr-zone.com/showpost.php?p=638009&postcount=22

http://www.pcstats.com/articleview.cfm?articleid=873&page=1

stealth

[Sunfire]

Some guys believe that you can run four sticks or four gigs of Ram at DDR400 1T,by setting Tref,MAL,Read Preamble e.t.c. you may be able to slow down the Ram enough to make it run at 1T, i don't have four sticks to try but may is worth to give it a try.

http://forums.extremeoverclocking.co...d.php?t=170999

http://www.diy-street.com/forum/show...64&postcount=1

http://www.diy-street.com/forum/show...33&postcount=7

http://www.diy-street.com/forum/showthread.php?t=11397

http://forums.vr-zone.com/showpost.p...9&postcount=22

http://www.pcstats.com/articleview.c...eid=873&page=1

stealth

All of them are 404 :confused:

[stealth]

All of them are 404 :confused:

Sorry,fixed.

stealth

[Grandpa]

No it does not limit it's Overclocking. While you will not be able to run 1T settings with higher clock speeds if you use 2T settings with 4Gigs there is very little diffrence in benchmark scores verses 1T settings at the same timings. At least in Vista 64bit. Check out the link below, I am running Patriot Extreme PC3200

http://service.futuremark.com/compare?c=3742436_5

[stealth]

No it does not limit it's Overclocking. While you will not be able to run 1T settings with higher clock speeds if you use 2T settings with 4Gigs there is very little diffrence in benchmark scores verses 1T settings at the same timings. At least in Vista 64bit. Check out the link below, I am running Patriot Extreme PC3200

The only reason that the scores are so close is because the four sticks have an advantage over the two sticks in Vista 64bit.

With two sticks most Ram is used by the O/S and this makes 3DMark to run very slow.(have a look how much Ram left free with two sticks and how much with four,poor two sticks been strangled by the 64bit O/S)

Use Win XP Home SP2 for the two sticks,overclock the Ram to the highest can go also run the test at the same resolusion and then you will see if four sticks perform the same as two sticks.

Even if you use Vista 32bit for the two sticks you will see the difference.

stealth

[Grandpa]

Unfortunatley I do not have an XP Pro SP2 32bit to compare at the same Gh/s But as you can see in the link below they are very close. I will repeate it does not limit Overclocking.

http://service.futuremark.com/compare?c=3742436_3

[darkorb]

i have 4 sticks of Kingston value ram, ddr400, and a asus a8n-sli se with x2 3800+

i clocked it up to 2.7ghz, 270x10, ram is at ddr450, 3-4-4-8, 2.8v

[stealth]

i clocked it up to 2.7ghz, 270x10, ram is at ddr450, 3-4-4-8, 2.8v

I will repeate it does not limit Overclocking.

I don't say that you are not able to overclock the Ram with four sticks.

What i say is that two sticks will perform better than four for a simple reason.

Command Per Clock(CPC):
"This BIOS feature allows you to select the delay between the assertion of the Chip Select signal till the time the memory controller starts sending commands to the memory bank. The lower the value, the sooner the memory controller can send commands out to the activated memory bank. When this feature is enabled, the memory controller will only insert a command delay of one clock cycle or 1T.When this feature is disabled, the memory controller will insert a command delay of two clock cycles or 2T.
Effects: Large effect on Bandwidth, Medium effect on Overclocking".

stealth

[Grandpa]

As I said before a person with 4GB of ram will have to run in 2T. But that does not mean the memory will not preform as well as a 1T setting. If you look at the CPU score in the link I provided for XP you will see that even with a lessor CPU clock speed the results are pretty much = 2GB 1T vs 4GB 2T They were both run at the same timings 2.5-6-3-3 If I remember correctly. I ran allot of benches experimenting with 2GB V's 4GB 1T V's 2T and found very little difference.

I did find that 1T V's 2T did make a big difference when only running 2GB but that difference disappears when you add the 2 extra GB. I do not know if that is because there is greater bandwidth over 4 sticks or not. I only know the results of my testing.

[STEvil]

4 dual-rank sticks makes 8-way interleave with 2T possible (over ~210mhz, stuck below there at 1T).

2 dual-rank sticks makes 4-way interleave with 1T possible up to ~300mhz.


Both have advantages and disadvantages.

[Quintero]

4 dual-rank sticks makes 8-way interleave with 2T possible (over ~210mhz, stuck below there at 1T).

2 dual-rank sticks makes 4-way interleave with 1T possible up to ~300mhz.I think you're wrong, for two reasons:

1) The controller sees each pair as one 128-bit wide module, and they're always being accessed in lockstep. Even though the effective row length is doubled, which is an advantage, the banks will be treated as one, and the controller cannot allocate unrelated data between them.

2) This is not a matter of simply counting ranks, but more so the total number of internal banks seen by each channel (in this context). All DDR1 memory has four internal banks per rank. Whether you have four dualranks in dualchannel or two dualranks in singlechannel, 16-way interleave is possible. Two dualranks in dualchannel would enable 8-way interleave.

[darkorb]

2 sticks of ram, 1t, 4 sticks of ram 2t

2t is slower than 1t, 2 sticks of ram is optimal

[STEvil]

quintero - i'll run a bench when I get time tomarrow and see if anything changes between 4x512 dualrank vs 2x512 dualrank.

[ea6gka]

hi ,

http://img401.imageshack.us/img401/7824/untitled4xd8.jpg

with intel

http://img137.imageshack.us/img137/4095/561sj2.jpg

with AM2

memory is Ballistix 5300 GMH @ 2.2V

[Quintero]

quintero - i'll run a bench when I get time tomarrow and see if anything changes between 4x512 dualrank vs 2x512 dualrank.Something will change for sure, but I was referring to the definitions and policies of the IMC. 4x512 has the advantage when it comes to latency hiding - but 1T also makes a big difference for socket 939. Certain settings also determine how effective the extra interleave is - Idle Cycle Limit and Bypass Max seem to be particularly influential.

[STEvil]

I agree 1T is good but 2T isnt bad as long as you have 4 dualrank sticks.. 1T vs 2T using only 2 dualrank sticks is no question on which is faster.

Here's my current settings.. and CLKIN is at 300ps delay for 1/3 and 2/4 as well.. darned CFX3200-DR ;)

Also running cas2 because my tcce has been heavily abused and dislikes cas2.5 now.. :rolleyes: