E6 Venice can't go past 2.4 GHz

[beveritt]

Hello all!
I have a new system spec'd out as in my sig and I can't get it to go past 2.4 GHz.

Right now I have the LDT at 267 with the stock 9X multiplier. I had to bump the vCore to 1.5V but my chipset and RAM voltages are still stock. I have the RAM running at DDR280 (7/10), so roughly 187 MHz at the advertised 2-3-3-7-1T. Setup this way I ran the Prime95 blend test for 16.5 hours with no errors before I stopped it. My temps were 32C idle and 46C load with a Zalman CNPS7000B-ALCU.

Every time I try to go over 270 on the LDT I cannot POST. I have tried all of the following to get it to clock higher:
Set RAM to DDR200 (1/2) and 3-3-3-8-2T timings and with SPD timings
From 1.5 through 1.65 on vCore
RAM voltage raised from 2.6 to 2.7
Chipset voltage raised from 1.5 to 1.7

I tried every combination of all those things, including two attempts with all the voltages maxed out, and the RAM timings at the slowest. Still, no POST. Do you have any suggestions? I suspect that the RAM is holding me back, but even with it set to DDR200 and slow as molasses timings it won't finish the POST past 270. If 2.4 is as fast as I can go I'm cool with it. It's plenty fast and runs very stable at that speed. Thanks!

 

[adiabaticgfx]

Did you lower the LDT(HT) ratio/multiplier so that the HTT x LDT(HT) doest not equal over 1000mHz? Most DFi boards should at least break 300 HTT, I personally can boot to windows with 395 HTT on my Abit AN8-Ultra as long as a change the HT ratio/multiplier.

You probably shouldn't be running 2T timings on the RAM either.

Let Prime95 run for 24 hours also. Large FFT.

 

[n7]

There's one thing you're missing.
LDT.

What you are calling LDT is actually HTT (akin to FSB)

LDT is the multiplier for the HTT.
LDT x HTT = HT freqency (5 x 200 = 1000) normally

You need to set your LDT (or HT multi) to 3x or 600

Depending on the motherboard:
LDT wordings =
1x = 200
2x = 400
3x = 600
4x = 800
5x = 1000

 

[Furen]

LDT is lightning data transport, which is the old name of the Hypertransport link. No one should be using the term LDT anymore, since it was renamed in mid-2002, but I guess some bios programmers like using the old name...

The hypertransport operating frequency is derived from two things: the HTT (what you are calling LDT), which can be set in ranges 200-400MHz in 1MHz increments (the range depends on the motherboard) and the HT multiplier, which, in truth, can be a number from 2 to 5 (including halves). The HT multiplier is somethings controlled by a bios setting called "Hypertransport frequency" which can range from 200 to 1000Mhz in increments of 200MHz (increments of 100 are possible but I don't remember seeing them). If you do have your HT multiplier in increments of 200MHz all you need to do is divide the number by 200MHz to get your real multiplier. As n7 said, you should keep your real Hypertransport operating frequency at 1000MHz or less (some motherboard can do a bit more but there's no performance benefit beyond around 700MHz), meaning your HTT times your HT multiplier has to be less than 1000.

 

[beveritt]

Sorry if I used the incorrect terminology. I have the HTT set to 267 MHz and the HT multiplier is at 3X, or 801 MHz.

Adia, I tried the RAM at SPD, and manually at various settings including the current 2-3-3-7-1T all the way through 3-3-3-8-2T, including 3-3-3-8-1T. I plan on running Prime95 for 24 hours before I call it done.

Any ideas on how to get my HTT above 270? Everything I've tried so far has failed. I personally think it's the RAM because I had seen similar POST failures earlier in the process and cutting the DRAM ratio down would fix it. However at 270 I should be able to POST with the RAM at DDR200 and 3-3-3-8-1T, when it works fine at 267 with DDR280 and 2-3-3-7-1T. Strange...

 

[adiabaticgfx]

To find your max HTT you should drop your CPU multiplier to 6x and go up in 5mHz increments.

I didn't read anywhere that you dropped your multiplier so your CPU mHz might be maxxed, try dropping it to at least 6x then start upping your HTT with those RAM settings in a 1:1 ratio.

 

[fbrdphreak]

Read this
http://forums.anandtech.com/messageview...atid=28&threadid=1497607&enterthread=y

Follow instructions to the letter and report results of each section

 

[Hacp]

If you really can't do anything then be happy with 2.4 GHZ .

 

[Furen]

Set your DRAM ratio at DDR266. Also, try 2T command rate. If neither of this nor the combination of the two works then you can just give up .