new ram stops overclock

[j.col]

hi guys i have a strange problem.

i have an E3300 with 12.5 multiplier, 200 fsb the stock speed is 2.5GHz
before i could overclock it to 255MHz fsb (nearly 3.2GHz)
on a Foxconn G41MX-F 2.0 mobo and 2gb (2x1gb) of cheap crucial ddr2 pc2-5300 ram.

my problem is i have bought 4 gb of Geil Black Dragon 2x2gb pc2-6400 800MHz latency cas 5 5-5-5-15

now i can't get past 210Mhz fsb in my overclock, or i get a bsod.

i have tried upping the voltage by 0.1, 0.2 and 0.3, i cant increase higher than that. but it makes no difference.

i ran memtest85 for 15hrs with no errors on the geil ram.

any ideas, what i am doing wrong?.

if i do the optimised defaults in the bios, it makes the ram go to 3-3-3-9 then it wont even boot and i have to clear the cmos
then i have to manually input the timings


also the ram is rated at 5-5-5-15, but in cpu-z it says 5-5-5-18.
also ignore the foxconn pic, its just me double checking volts and freqs.

By jcol at 2010-12-06

 

[setter]

As your running 4 memory sticks youll need to increase the NB voltage a bit, 4 memory dimm's place a bit more strain on the NB, so a bit more voltage is required.

 

[j.col]

hi settler, i am not sure if i know how to do this

edit. as far as i can see i have no option to increase the cpu or NB voltage in bios

 

[j.col]

i have increased the ram voltage by 0.2v
and i took the dram frequency off auto and set it to 667MHz.
then i set fsb to 240 and its booted fine.
i have just run a quick 15min OOCT linpack test and it came back with no errors.
i will run a proper one later or prime95.

but looking in the foxconn app, i see that my dram frequency is 800mhz.

at a guess, is this the mobo?
it cant go much higher than 800mhz?

 

[j.col]

As your running 4 memory sticks youll need to increase the NB voltage a bit, 4 memory dimm's place a bit more strain on the NB, so a bit more voltage is required.

sorry mate i didnt make myself clear.
i only have 2 ram slots on the mobo. i have replaced 2 x 1gb with 2 x 2gb

 

[allday247]

sorry to hear your having trouble with the ram you bought from me j.col. They were extremely stable on my PC (mobo P5K-E wifi).
I think the rated volts is 1.8v and in my bios settings i always left that on auto.
When i was OC'ing my ram i set it 1:1 with the FSB, where my FSB was 450. Hence Ram ran at 900Mhz. From your small image it looks like you've set the FSB ratio to 1:2. If you've got your FSB to 240 wouldn't that mean the ram is effectively running at 960Mhz? (240*2) *2? I might be wrong here.

Let me know how you get on mate.

 

[j.col]

sorry to hear your having trouble with the ram you bought from me j.col. They were extremely stable on my PC (mobo P5K-E wifi).
I think the rated volts is 1.8v and in my bios settings i always left that on auto.
When i was OC'ing my ram i set it 1:1 with the FSB, where my FSB was 450. Hence Ram ran at 900Mhz. From your small image it looks like you've set the FSB ratio to 1:2. If you've got your FSB to 240 wouldn't that mean the ram is effectively running at 960Mhz? (240*2) *2? I might be wrong here.

Let me know how you get on mate.

hi mate, thanks for advice, i sent you email

 

[j.col]

i just put everything back to auto, and its working again
and yet the other day, on auto settings my pc wouldn't boot

i still have a FSB:dram of 1:2 but i don't think i can change it on this crappy mobo. or is it a math question? like "In order to run 1:1 the RAM needs to be half the speed of the FSB such as 1600FSB and DDR2 800 or 1333FSB and DDR2 667."
if so what are the settings?

i have got the pc stable to fsb of 250Mhz but will run it at 240Mhz

By jcol at 2010-12-06

 

[allday247]

from what i can see your FSB is set to 240 in that pic.
deduced by dividing the DRAM Frequency by 2. Thus your effective ram speed would be 960Mhz... can someone with more knowledge confirm pls. Thats a good overclock on the ram if my math is right.

by upping the fsb you might be able to squeeze more but then you could be hitting issues in other areas.

 

[j.col]

i have been googling and learning.
it seems that as my cpu only has a 200MHz FSB this will limit what i can reach.
thanks any way simon for the help

i am happy with 3.0GHz on this chip, i can get it to nearly 3.2GHz but i like to hold back abit

i knew it wasn't the ram, it was just my inexperience

 

[Big.Wayne]

• Intel® Celeron® E3300 (12.5X200)
• Foxconn G41MX-F 2.0 (Intel® G41 Express) Motherboard
• 2GB (2x1GB) "cheap" Crucial DDR2-666
• 4GB (2x2GB) Geil Black Dragon DDR2-800

Hi j.col

I think I can see what the problem is . . . the short answer is your first set of DDR2-666 RAM was able to be overclocked to DDR2-1020 but your Geil Black Dragon DDR2-800 isn't happy running as fast!

What you are doing is using the [1:2] memory multiplier which is designed to take a system running at 200MHz-FSB (800MHz System Bus) and push the memory up to 400MHz (DDR2-800) . . . the maths is worked out like so:

[1:2] Memory Multiplier

• 200/1x2=400 (DDR2-800)

200MHz FSB
Divided by One
Multiplied by Two
Equals 400MHz

as you manually boosted the FSB upwards from 200MHz to 255MHz you changed the maths like so:

• 255/1x2=510 (DDR2-1020)

255MHz FSB
Divided by One
Multiplied by Two
Equals 510MHz

At 200MHz-FSB there is another memory multiplier you can use . . .

[3:5] Memory Multiplier

• 200/3x5=333 (DDR2-666)

200MHz FSB
Divided by Three
Multiplied by Five
Equals 333MHz

• 240/3x5=400 (DDR2-800)

240MHz FSB
Divided by Three
Multiplied by Five
Equals 400MHz

So if you are unable to get sync [1:1] working and are stuck with [3:5] then the highest FSB you can get without overclocking your RAM is 240MHz

Intel® Celeron® E3300

• 12.5x240=3000

Here is a chart showing you what Memory Multiplers you get at different FSBs . . .

 

[j.col]

thanks bigwayne
so basically the cheap ram runs better on my board than "proper" ram

if i got a Q6600, will this help my "proper" ram?
if i run the Q6600 at 333x9? what will be the affect.

going by the chart above, running the fsb at 333 should get me 1:1 at 667mhz
or 6:5 at 800mhz

3:5 as 333/3 x 5 = 555 or 1100mhz

 

[Big.Wayne]

so basically the cheap ram runs better on my board than "proper" ram

Yeah, although they are both "proper" ram although the 2GB Crucial sticks just overclock like a beast! . . . and probably would do on any board.

if i got a Q6600, will this help my "proper" ram?
if i run the Q6600 at 333x9? what will be the affect.

The processor will not affect the ram in any way . . . when you plug in the Q6600 the GEIL ram will default to [2:3] DDR2-800 and the Crucial Ram will default to [4:5] DDR2-666 . . .

If you then overclock the Q6600 to 3GHz (9x333) the Geil ram will need to be set to [5:6] DDR2-800 and the Crucial Ram will will need to be set to [1:1] DDR2-666 . . .

going by the chart above, running the fsb at 333 should get me 1:1 at 667mhz
or 6:5 at 800mhz

Correct!

Just wanted to add. the memory multiplier figures I am writing in [brackets] are how you will see them displayed in CPU-z . . . the chart shows them in reverse . . . if you work from the chart just reverse the maths . . .

so [5:6] as seen in CPUz is

FSB/5x6

and 6:5 from the chart is

FSBx6/5=

[3:5] as 333/3 x 5 = 555 or 1100mhz

Yup if the sticks are happy at that speed! . . . I got some Crucial DDR2-666 that is happy running at DDR2-1200 so anything is possible!

Just a further point to add regarding that chart and memory multipliers in general . . . it totally depends on the quality of motherboard/chipset which memory multipliers you get . . .

On a very basic board/chipset you will only get the memory multipliers that are associated with the "native" FSB of your processor . . . so if you plug in a 200MHz FSB chip you get just [3:5] and [1:2] . . . on slightly better boards you get an option called FSB strap (200/266/333/400) that you can change . . . and once changed will open up the next set of memory multipliers i.e you start with a "native" 200MHz FSB chip which as mentioned above gives you [3:5] and [1:2] options . . but you then change the FSB strap from 200 to 266 which removed the first two memory multipliers and replaces then with [4:5] and [2:3] . . .

On the very best boards you get access to any and all memory multipliers, you don't need to change the FSB strap just look in the BIOS under DDR2 frequency and you see a whole heap of different memory speeds at your disposal . . .

I personally found it better to avoid [1:1] memory multipler and run the RAM on a memory multiplier and get the sticks clocked to within an inch of their life . .. you can slacken timings a tad and also add voltage to help get the sticks running at Hyper-speed . . . just keep them nice and cool i.e not too hot to touch!

 

[allday247]

lots of nice information there Big wayne. j.col you'll be fine if you follow his advise! he's knowledge far exceeds that of mine! sorry i haven't responded to your trust message btw. was off work yesterday and that is my trust email.

 

[j.col]

thanks guys for the excellent help