Transcend Jetram PC6400 2x2Gig

[Khalmyr]

Yes it is the stick with "P" on them.. it's the exact same kit being sold on newegg (JM4GDDR2-8K)

edit: maybe I just don't know this board well enough yet...

been running OCCT at 450mhz 5-5-5-15 1.8v for an hour now

seems to like the 5:6 divisor

all sub timmings on auto

[Khalmyr]

This is the one I got



edit:

it just won't work at 1000mhz...

even at 5-6-6-18

if I set vmem +0.2 at bios, it gives me 2v at idle and 1.9v at full load... occt lasts about an hour then..
if I set vmem +0.3 at bios, it gives me 2.11v at idle and 2.1v at full load... occt doesn't last 1 minute like this...

this is so very weird.. i think it's my mobo... but i don't have any other mobos to try it on. damn why did i have to buy this cheap motherboard

[Gilgamesh83]

I think you have a different batch of the powerchips, because the difference I was pointing out in my screenshot of my spd in cpu-z is that mine have a spd standard of 5-5-5-18 in 400mhz while yours have 5-5-5-16.
That is different and if you look at your date cpu-z you'll see that they were created 2007 while mine and dr.learys are made in 2008 since we live in the same country of sweden. Simply you might have old powerchips while we have a newer revision of the powerchips.

It would seem that date matters when it comes to these sticks of ram.

edit: I have the same board and it works :p

[Khalmyr]

hm.. sucks for me eh?

what sub-timmings did you set at the bios?

also, what bios are you using? i'm on F10, but will flash F12 tonight

edit: been running at 1000mhz for 1 hour now @ 1.96v. but the timmings suck... if i try and raise the voltage more, it gets worse.

[Gilgamesh83]

I think that you might have to settle for less than 1000 in your case because if it can't do 1000 at 5-5-5-15 2v then you can't no matter the settings in bios but if I remember with the f10 bios is that the subtimings setting are different so to upgrade to f12 isn't a bad idea, give it a shot. Just remember to clear cmos manually after the bios upgrade right after the upgrade. And don't use the windows update tool use the dos based and if you have a diskette or a boot cd use that instead.

Hope it works out for ya.

[ken]

@Khalmyr: where did you buy those sticks? from aria.co.uk by any chance?

[Khalmyr]

Nah, I live in Brazil. Bought them around here.

[ken]

Nah, I live in Brazil. Bought them around here.

ah ok, Im thinking of buying those sticks from aria.co.uk and just to make sure Im not getting the same "old" batch

cheers

[Khalmyr]

hahaha

yeah, i wouldn't want the sticks i got if i were to buy them again =P

by the way

was anyone able to run them at 4-4-4-X and to they get any improvements with 2.2v+?

[Spyrus]

If with 1.9v last occt longer then i think it is a temp issue.
Your timings with 5-5-5-15 screenshot are ok and a bit loosen,
so there is no problem. Put a fan over them to test any difference and
report back.

[Khalmyr]

it wasn't temp...
anyway, i found out what's holding me back.

this is the best I can do:



6 hours of orthos stable.

so I guess tRCD doesn't like me. as long as it's 6 from 500mhz on, it will be fine.

not quite what I expected, but I guess it's ok.

1000mhz 5-6-4-15 2T 1.95v

higher voltage doesn't help either.

weird IC's....

now since i don't really understand much of timmings, my question is: is tRCD being left at 6 a big deal?

[Khalmyr]

anyone?

[Rammsteiner]

What Drive Strength settings does Intel/your board offer? Set them to low/weak, whatever. If more Voltage doesnt help it might be a sign of too high Drive Strengths. Didnt read whole thread but I assume you already played with NB Voltages right.

Also, not entirely sure, I didnt see that MCHBAR to be 'on' on other Intel OC Memset screens? As I said, not 100% sure, Ive no clue about Intel really.

[Khalmyr]

yeah i did try raising the vmch

No idea what you mean by "drive strength" though

[Dr.Leary]

Sorry to say it seems you have a weaker batch. I don´t think your pair will go much higher regardless what you do. Thats the way it is in the world of of overclocking. You can´t really be sure of what you get.

[Khalmyr]

dang

if all those memories use the same Powerchips ICs how can there be some so much better than others?

i can't even do 800 4-4-4-12 2.3v

at least it goes up to 920 5-5-5-15 1.8v

thanks everyone.

[Gilgamesh83]

The thing is that they are not the same ic's only named powerchips. Just like micron have several d9's, powerchips have other revisions of well... powerchips.

Think of as different chips altogether and go from there, simply put; results will be totally different.

But it's a damn shame in your case. I would recommend people to buy single modules that have the same case-color as the one in my earlier post. And I do believe that the date is stamped onto the ic's themselves as 0804 or something like that.

[Khalmyr]

can you run 800 4-4-4-12?

[Gilgamesh83]

nah having faster ram in mhz is better than timings or at least the same.

[regenade]

Got one set today

Some preliminary testing


Image Hosting

[Gilgamesh83]

yep!

you got the right stuff alright. JM800QLU-2G the same as mine and it would seem you got the same batch as me too.

[Khalmyr]

One last update

I've tweaked all I could with this ram by now

It runs 5-6-3-13 @ 1066mhz 1.98v

Won't work with tRCR @ 5 above 975 no matter what I try.

thanks for all the help

[SuperStarr]

This RAM (w Powerchip IC's) how much can be OC-ed with CL4?
Regards!

[Spyrus]

Best is up to 460 CL4

[Mungri]

Khalmyr have you tried loosening the subtimings?

My OCZ was only stable up to 888 Mhz on default subs, but when I loosen them to highest (63-15-15-15) it goes awesome XD.

I notice absolutely no reduction in speed or bandwidth either, sandra is measuring 8.10 Gb/s at my sig settings.

I keep forgetting to test mine any higher higher, but they should scale nicely with 2 higher Tras.

Subtimings need to be loosened on 2x2 Gb kits, but it makes visually no reduction to speed at all.

This ram looks awesome for the price, like the Hynix 1 Gb modules! But I prefer my OCZ heatspreaders and fan mounted above them :p

This week, 2x2 Gb PC6400 ballistix red and the PC8500 version of my ram are on offer at OCUK for £76 and £105. If I was rich I would also buy the ballistix to play with.