Tom's Hardware > Forum > Motherboards & Memory > Memory > Overclock my RAM bus speed
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Bob369   07-19-2005 at 03:27:16 PM

I recently bought some new computer parts and installed them. I downloaded Sandra software and checked out my computer specs. According to the software my FSB runs at (2x1000) Mhz, but my memory bus speed is only 2x230 mhz. How do i overclock my RAM to match my frontside bus speed? Or how would i get a suitable ratio.

ABIT AX8 Socket 939 VIA K8T890
http://www.newegg.com/product/prod [...] 6813127187

CORSAIR XMS 1GB (2 x 512MB) 184-Pin DDR SDRAM Dual Channel
http://www.newegg.com/Product/Prod [...] 6820145450

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Rugger   07-19-2005 at 03:41:58 PM
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If you're FSB is 2X230, then your RAM is already OCed. Default is 2X200Mhz. Di you make those adjustments to the FSB?

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Bob369   07-19-2005 at 05:57:32 PM
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No I never made any adjustments to the RAM or the FSB. That is standard settings by whatever Abit put in.

I can get a screenshot of the Sandra output in about an hour or so.

Maybe im mistaken but i thought the whole point of having dual channel ram was to exceed the 400 mhz ram speed.

The way I understood if you had dual channel ram each running at 400 mhz you could get close to a total of 800mhz on your ram speed. Like i said i could be wrong,im not the best with hardware.

my board also comes with this utlity called uguru from abit.. it allows me to OC my system through windows.. ill take a screenshot of it also so you can see the voltage settings.

the memory is at 2x204 mhz (408mhz)
<P ID="edit"><FONT SIZE=-1><EM>Edited by Bob369 on 07/19/05 01:11 PM.</EM></FONT></P>

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Anonymous   07-19-2005 at 07:14:01 PM
- 0 +

DDR ram runs at 200mhz, putting twice the data eveyr mhz resulting in 400mhz theroical speed(as fast as SDR400mhz wich obviously doesnt exist)

So two channel result in the bandwith equivalent of SDR800mhz matching your cpu's bandwith.

Maybe you got an option that automaticly overclock your computer in the uGuru stuff...Because as stated above ram should be at 200mhz!

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0

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Bob369   07-19-2005 at 07:20:36 PM
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yeah i went home and checked it at lunch.. it is running at 2x204 mhz (i edited post above)

do you know how i could tell if i was getting the full 800mhz? And if i am getting 800mhz how can i increase it to match my cpu?

the options i can edit in uguru are

vcore
vnb
vsb
vddr
vddrref
vht

i can also change the PCIe and processor Mhz

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fishmahn   07-19-2005 at 08:05:47 PM
- 0 +

If your mobo supports dual channel (Sandra should tell you if its in dual channel mode), then the 2x200mhz X 2 for dual channel memory = 800.

That's the only way to do that. Even if you were to oc the RAM, I don't think any PC3200 RAM can hit PC6400 (400mhz x 2) speeds...

Mike.

<font color=blue>Outside of a dog, a book is man's best friend. Inside the dog its too dark to read.
-- Groucho Marx</font color=blue>

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Anonymous   07-19-2005 at 08:16:44 PM
- 0 +

PC5000 is the highest currently available...have pĥun! heh

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0

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Bob369   07-19-2005 at 10:20:03 PM
- 0 +

my board only supports up too 3200.. so does this mean that i cannot oc my ram?

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Crashman   07-20-2005 at 12:46:30 PM
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The support list are incomplete. All of them are. Your board supports PC4000, PC4200...

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Bob369   07-20-2005 at 02:19:01 PM
- 0 +

well i have come to find out that the uguru utility i have in windows overclocks everything. The way it overclocks my FSB speed = my CPU speed. Now thats pretty amazing. It also overclocks my memory by the same mhz rating.

CPU 2400 mhz = FSB 2x1200 mhz = MEM 2x(2x240) mhz

but thanks for the help anyway... i didnt reallized that it did it all together.

thanks for posting about the RAM crash ill check into that some more and see.. i just bought my RAM though so i doubt im going to be changing it out anytime soon.

I do have a couple questions though.. say i overclock my RAM to 240 mhz from 200 mhz. How would i test the stability of my system? Use it and see how it runs?

And if it is slighly unstable do i increase the VDDR to make it more stable?
<P ID="edit"><FONT SIZE=-1><EM>Edited by Bob369 on 07/20/05 08:24 AM.</EM></FONT></P>

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Anonymous   07-20-2005 at 03:53:20 PM
- 0 +

I doubt your front side bus is running at 1200mhz!!

Anywayz use memtest and prime95, make sure you monitor the temps of your cpu/motherboards!


Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0

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Bob369   07-20-2005 at 04:03:24 PM
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yes my FSB runs at that speed.. at default setting it runs at 1000 mhz. With the 64 bit socket 939 processor you can get a FSB that high using the Hyper Transport Technology. I get the 1200 mhz when I OC it. If you dont believe me you can check out my board... http://www.newegg.com/product/prod [...] 6813127187

My motherboard has built in temperature sensors for the CPU and the board. With the Abit utlities I can monitor them in Windows.

I was usuing Sandra 2005 and it said i get 2x1200.. im assuming that you get the 2x (2400 mhz) by considering both directions but im not postive about that

<P ID="edit"><FONT SIZE=-1><EM>Edited by Bob369 on 07/20/05 10:04 AM.</EM></FONT></P>

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Anonymous   07-20-2005 at 05:11:15 PM
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Ok I beleive you, its just terminology... Thats not exactly a FSB its a Hyper Transport bus speed...

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0

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Bob369   07-20-2005 at 05:18:42 PM
- 0 +

Both cpu-z and sandra report that as my FSB speed

My PC:
Abit AX8 Socket 939 VIA K8T890
AMD Athlon 64 3200 Winchester
Sapphire Radeon X700 Pro 256 Mb PCIe
WD Raptor 37 Gb SATA
Corsair 2x512 PC3200 DDR Dual-Channel Platnium Edition

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fishmahn   07-20-2005 at 05:38:44 PM
- 0 +

Actually, that is the fsb. Hypertransport is an FSB protocol. What 'everyone' calls fsb is the clock signal sent to the CPU, not the FSB (but only for the A64 - everywhere else its' the FSB speed).

Mike.

<font color=blue>Outside of a dog, a book is man's best friend. Inside the dog its too dark to read.
-- Groucho Marx</font color=blue>

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Anonymous   07-20-2005 at 05:51:33 PM
- 0 +

Oh allright, I still find it misleading heh

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0

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Crashman   07-20-2005 at 08:58:53 PM
- 0 +

Yes, VDDR can be used to increase memory stability. Most modules should be able to handle 2.80v fairly easily, but some are designed to tolerate even more.

<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>

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Bob369   07-20-2005 at 09:14:41 PM
- 0 +

yeah i was experimenting last night and had the CPU and everything cranked up to like 2500 mhz.. then change the vddr to like 3 and my comp shut off lol.. a quick reset of the cmos fixed that.

my latency on my RAM is like 2 but my VDDR is set to like 2.6. Generally, does bumping up by say .1 or .2 make a big difference in stability or should i increase it by more?

My PC:
Abit AX8 Socket 939 VIA K8T890
AMD Athlon 64 3200 Winchester
Sapphire Radeon X700 Pro 256 Mb PCIe
WD Raptor 37 Gb SATA
Corsair 2x512 PC3200 DDR Dual-Channel Platnium Edition

Reply to Bob369
Crashman   07-21-2005 at 06:22:37 AM
- 0 +

.1 or .2 can provide a big increase in stability, but it's not garunteed. More can help only a few modules that are designed for it.

<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>

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