Losing 10x multi on e8600 with FSB above ~ 470 mhz

[storm-chaser]

Any advice? When I reboot at anything above 470Mhz FSB the CPU defaults to the lowest multiplier. I can then go into the BIOS and adjust the multi to 9.5 or below.

If I set it back on the 10x multi it simply defaults back to the lowest multiple (on reboot) instead.

In testing I can see the CPU appears to support above 500 MHz on the FSB... just this weird multiple issue... wondering if this is a known issue when running high FSB speeds.

Running with an Asus P5Q3 mainboard.

 

[unclewebb]

Is SpeedStep enabled in the bios? I know that many Dell motherboards will default to the 6 multiplier when SpeedStep is disabled.

The E8600 was the end of the line for the Core 2 Duo. I assume you are running the latest bios. Maybe no one noticed this bug you found so the bios never got fixed.

You should be able to use ThrottleStop after you boot up. Enable SpeedStep and set the multiplier to whatever value you like.

 

[hat]

Sounds like something @agent_x007 would know about. My best guess is you need more voltage somewhere... NB would be the most obvious, followed by something like "FSB Termination Voltage". Or maybe you're just running into core limits. You're going beyond 4.7GHz at this point. You probably need an insane level of vcore.

 

[agent_x007]

If I understand this correctly, you simply want to go past 500MHz FSB (or 2GHz effective) ?
In that case, you need lowest possible multiplier on CPU (also, there may be only one memory divider that is stable at over 500MHz FSB, FYI).
If you want best Frequency/FSB ratio (depending on CPU/memory), I would go for around x8 value on multi and highest stable FSB you can get.
I did OC'ed my E8600 WAY past 500MHz mark, however I did not encounter this issue on my Rampage Extreme (different board/chipset, so it's unlikely for my board to have it though).
Granted, I never tried to do x10 multi on 500MHz FSB either

 

[cadaveca]

GTL @ 0.56 /0.63?

 

[freeagent]

I was able to nail down 550fsb mems 1:1 24/7 with gtls maxed. I was able to nail down 600fsb but ram wouldn’t go any higher. I don’t recall what voltages I was using for the board though. I no longer have that e8600 just a quad Xeon that tops out around 475fsb I think. I have to assemble that thing sometime, just needs a gpu and ssd.

 

[storm-chaser]

Thanks Guys! For the time being I've settled for 460Mhz FSB at 10x multiple. With the 3:5 DRAM:FSB ratio we are running 766Mhz DRAM Freq.

I really need better memory to support this processor and all of it's capability. Anyone have DDR3 2000+ memory they could let go for cheap?

AND

 

[agent_x007]

But would you need 2000MHz+ memory ?
Just use 1:2 divider ([FSB : DRAM]), and you should be fine with up to 766MHz FSB on RAM you already own.

 

[storm-chaser]

But would you need 2000MHz+ memory ?
Just use 1:2 divider ([FSB : DRAM]), and you should be fine with up to 766MHz FSB on RAM you already own.

Because then I can run DDR3 1800 or higher (if my mobo and CPU combo can support it). My current ram is only good to about 1700Mhz.

 

[Aquinus]

Remember that the Core 2 series chips don't have the memory controller on the CPU, it's on the MCH. If you're pushing the MCH harder with a faster FSB, you may need to bump voltage on the MCH/chipset on it to keep it stable as you clock it higher and you should make very sure that it's adequately cooled because most of the time, it's passively cooled. If the OP knows that the the memory can run faster and there appears to be a FSB barrier, it's likely the MCH holding it back.

 

[agent_x007]

Because then I can run DDR3 1800 or higher (if my mobo and CPU combo can support it). My current ram is only good to about 1700Mhz.

But there is absolutly no point in doing so.
1800MHz isn't going to "magically" make games play faster, or games to have higher FPS (vs. for example 1500-1600MHz).
Also, because of timings, tRD, and other stuff - you may end up with slower memory overall on 1800MHz+.

vs.

Needless to say, ^those settings aren't possible with 4 memory stick setup (FYI), and with DDR3 memory you need to extract every MHz out of FSB, to use extra bandwidth available as efficiently as possible.
FYI : ~55ns is latency level I achieved with my QX6850 at 520MHz FSB (using 16GB of memory at that).

 

[storm-chaser]

I'm just looking for every ounce of performance I can get from this rig that's why I was wondering about the memory.

Very impressive FSB agent 007!

 

[27MaD]

I had such problem and it was the EIST function enabled in the bios , it was reducing the multiplayer.