Samsung 2700 memory speed problem...

***Omegadrive*** · May 16, 2002, 10:46 PM

Just received today my new 512MB Samsung 2700 stick.
I ordered it because of the hype I have heard all over the net about the memory's oveclocking capability, but I'm a little disapointed with it right now, I can't get it to run at 200Mhz FSB, and many sites reported that the maximum speed they reached with it was 230Mhz CAS 2.5 and would run at 210Mhz CAS 2, but not even at 200 CAS 2.5 can I make it to boot

Any one knows why?

I'm running it right now at 176Mhz CAS 2 (v2.8), I can go higher, but right now, for various reasons I would not like it any higher (specially since my SBLive! 5.1 doesn't like speeds over 176Mhz, don't know why)

You can see my PC specs in my sig (not updated with the new memory thou)

Thanks for any help.

Ryoko · May 16, 2002, 11:14 PM

my brother has exactly the same mobo and ram you do, and he wasn't even able to get above 140mhz fsb...

May 17, 2002, 03:18 AM

that blows, take it back, get another brand and try it.

Mize · May 17, 2002, 06:38 AM

Hey Omegadrive:

Here's the deal...
First, make sure you're using the 04/11 BIOS on that MB - it's specifically dialed in to the Samsung chips.
Second, Samsungs require burn-in to hit top speeds. Get it running at your highest stable FSB and then run Prime95 for a few hours...then bump the speed again.
Also, make sure you're at 2.7 or 2.8 Vmem. 2.8 is undocumented on the XP333, but it's achieved by putting both jumpers to the right side.

I've found that Samsung doesn't go a whole lot higher in CL2.5 so I stick with CL2/Normal.

Mize

Silentst2000 · May 17, 2002, 02:28 PM

Yeah that samsung blows big time
only fucking 200 mhz cas 2.5 for me.

***Omegadrive*** · May 17, 2002, 06:28 PM

Ok Mize, I know I have to burn-in the memory, but the problem is that this mobo can't reach 3.0V on the memory, and thus, run at those speeds

(I'm running the 4/11 BIOS)
After the message I tried more things, I got it to run at 191Mhz CAS 2 and 194Mhz CAS 2.5, but after 195Mhz the computer won't boot, I think it has to do with the video card not liking the high overclock, cause I heard the PC post to the BIOS, but there was no video

So I changed the PCI divider to 1/6 and tried @195, no luck, still no boot, then tried 1/6 @ 194, success boot, but the PC locked when starting windows, so I guess the problem now is that the AGP card doesn't have enough juice with a 1/6 setting @ 194Mhz, of course, is running below the spec of 66Mhz, but now I think that if I can get the vmem up to 2.9 or 3.0 I can make it work at least at 200Mhz.

I base my assumptions on this article:
http://www.vr-zone.com/reviews/Memor...fDDR/page9.htm

As you can see the memory is VERY good, it's true PC2700 memory, not just overclocked like the others, and I ordered EXACTLY that model.

I'll try Prime95, but anyone knows if there is a trick to make this mobo run a higher vmem?
I'm running it right now at 186Mhz FSB CAS2/Normal

"If I could just reach that 200 sweet spot..."

Ryoko, that's too bad, I have been running it @ 176Mhz FSB with OCZ CAS 2.5 since I bought it and now @ 186Mhz FSB CAS2 with the new memory.

Silentst2000, How did you do it? What settings did you used in the BIOS?

Jeff · May 17, 2002, 06:54 PM

Here's the thing Omega, Iwill XP333 RAID has a prob with 512MB, but they are working on it. With only 256mb you would easily get it that high.

(I got lucky with my 2x256mb, but I have heard a ton of people have problems with more than one stick or a 512mb stick.)

***Omegadrive*** · May 17, 2002, 11:02 PM

Forge · May 18, 2002, 01:49 AM

At ~200MHz FSB, it's entirely possible that something else in your system is crapping out. The board itself just plain may not be able to handle the speed.

toddalaska · May 18, 2002, 09:59 AM

Omega definitely volt mod time to get 3.04, i believe its a 1.2k ohm resistor to reach 3.04

but i would check that with mize. no sauder jus t throw it in there its an easy mod at least

***Omegadrive*** · May 18, 2002, 11:52 AM

Forge, the board supports a PCI divisor of 1/6, so at 200Mhz FSB it would be like not doing any overclocking at all for the AGP and PCI, so it's not the hardware.

toddalaska, does the mod of the resistor requires any soldering?
If it is just a pencil trick no problem

UberLord · May 18, 2002, 12:22 PM

IMO, overclocking also requires a fair amount of luck. For example, I upgraded my Kyro 1 to a Kyro 2 - but this forced me to downclock from a FSB of 160Mhz to 142Mhz. As a test, I obtained another Kyro2 (same brand - Hercules) and was able to get back to 154Mhz.

This shows that regardless of brand and model, no two components over clock to the same extent.

Mize · May 18, 2002, 12:30 PM

Quote:

Originally posted by Omegadrive
Forge, the board supports a PCI divisor of 1/6, so at 200Mhz FSB it would be like not doing any overclocking at all for the AGP and PCI, so it's not the hardware.

toddalaska, does the mod of the resistor requires any soldering?
If it is just a pencil trick no problem

The 1/6 divisor kills memory bandwidth. 1/5 does not.

Omegadrive: Have you put AS or something on your chipset cooler? Usually that's required. To get much over 200 many folks are putting on better chipset coolers.

I've not done a Vdimm mod yet (work has been too busy), but certainly plan to go to 3.0 as my Samsung (cheap OCZ) won't break 185 CL2/Normal at 2.8...at least not the last time I tried.

Mize

toddalaska · May 18, 2002, 07:07 PM

Omega no sauder required for the volt mod. its just a 1.2k ohm resistor from 5-6 mem pin jumper to the mouting screw thats close there.

I owul research a little but Im 99% sure its 1.2k ohm but would checkit out.

***Omegadrive*** · May 19, 2002, 11:44 AM

Just saw in another site that the resistor used is 1K, and depending on the voltage you want to obtain you can go higher or lower, but for 3.04v is a 1K. It says there that you have to solder it, but I don't think that is necesary, I don't want to risk my MB that much for a little more power (or could I?...)
Anyway, what I need is a photo of the resistor already in place, so I can be sure of what I have to do.

Thanks for any help...

***Omegadrive*** · May 20, 2002, 11:02 PM

I just received the copper heat spreaders for the memory (boy, are they heavy!) but still no go, can't reach 200Mhz.

So officially I need more voltage

Anyone got a picture of how the vmem MOD is done?

toddalaska · May 20, 2002, 11:17 PM

http://www.amdmb.com/vb/showthread.p...5&pagenumber=2

very detailed pics and instructions on the third post from the top, give it a minute toload though

***Omegadrive*** · May 21, 2002, 03:35 PM

That's just what I needed, now, going to Radio Shack to get the resisitors, then come home to do the MOD, I hope I get to 200 CAS2.

Wish me luck!

***Omegadrive*** · May 22, 2002, 12:24 AM

It partially worked, I bought three different resistors, to be able to change voltages when I want.
tried 3.00v: max 196 CAS2 and 198 CAS2.5
tried 3.15v: max 199 CAS2 and 201 CAS2.5
tried 3.29v: max 201 CAS2 and 203 CAS2.5

But in ANY of them, the system was VERY unstable, it would boot, and load windows, but it didn't wanted to stay working after I ran Prime95, it will bring an error every time and in higher voltages the PC would HARD-LOCK.

I had to leave the 3.15v MOD and lower the voltage to 2.5 in the jumpers (which will efectively give me 2.85v), and left my old speed intact (185FSB).
I'll try to do some more burn-in later, to see if I can gradually increase the voltage and at least reach my 200 goal.

If you have any other ideas let me know...

Forge · May 24, 2002, 10:52 PM

Quote:

At ~200MHz FSB, it's entirely possible that something else in your system is crapping out. The board itself just plain may not be able to handle the speed.

I never said anything about AGP or PCI. I mean your BOARD may just not be happy running those speeds. The shipset or even the traces on the board itself may have impedence or ringing issues at 200MHz. Your voltage hack experience makes me suspect that even more.

At this point, I'd say either be happy with 185 or get another board and try again.

toddalaska · May 25, 2002, 02:29 AM

The iwill is still probably the best board for over 200 fsb desides the limits on the voltage the mem.

Omega, how long did you burn that stuff in?

and is it actual samsung or does it just use samsung chips? it should say samsung on the pcb. and grab you acf (advanced chipset features)settings from top to bottom, it may be something in there

you actually went higher than i would have tried, the mosfets on the board arent the stoutest things around.

if you can go 199 thats going to be your best bet, jus so you dont have to worry bot thwe 1/6 kicking in and slowing things down.

~~WyreTheWolf~~ · May 25, 2002, 05:23 AM

Return the memory, and order some PC3000 you will be able to reach a 400MHz ddr frequency with that. Good Luck!

toddalaska · May 26, 2002, 02:21 AM

WyreTheWolf,
From what iv read, and having some experience on the xp333 that omega has, the samsung is the best bet. The majoirty of the 3000 and 3200 uses samsung chips anyway, might as well buy it from the source.

thas the mem the vooltage ansd the max fsb attained
Memory Voltage Max FSB Sandra Memory Bandwidth Benchmark
Crucial DDR333 3.24v 205 2835/2542
Kingmax DDR400 2.68v 198 2753/2502
OCZ 3200 2.92v 178 2514/2283
Samsung DDR333 2.92v 205 2837/2531

ANyway Omega, id be thinking like a good 24 hours of prime95 at at least 166 fsb to get that stuff cooking for burn in, i can get you the exact burnin they used for that test as soon as he pops into messenger

~~WyreTheWolf~~ · May 26, 2002, 12:42 PM

I was using the XMS PC3000 memory, and I was able to hit 204MHz @ Cas 2.5 with a voltage of 2.96 (at least that was the voltage reported by the motherboard... who knows how acurate that measurment is.) But anyways, I have had great luck with the overclocking ability of the XMS memory, and of course with Infineon.