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FSB limit on GIGABYTE GA-P35-DSL?

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February 5, 2009 10:23:13 PM

I have GIGABYTE GA-P35-DSL(rev 2.0) with BIOS version 4. Does it have FSB ceiling? Currently, I can't set anything over 390 MHZ

Can anyone who has this board confirm or dispute this?

here is my system:

Core 2 E2160 @3.51 GHZ (9x390 MHZ) with vcore 1.5v and all other voltages are raised by +0.2v

G.SKILL 2x1GB DDR2 800
Memory vs. FSB Frequency ratio is set as 1:1. so it's only 390 MHZ

To test my FSB ceiling, I choose 6x multiplier. When set at 6x391MHZ, it doesn't boot at all. If I try 6x390 MHZ, it boots and all working stable.

Thanks!

-sharpT
February 6, 2009 12:07:05 AM

Well, since you're OCing your CPU by almost 100% and have the vcore set very high (IMHO), it could be your CPU. Also, have you set your DIMM voltage to the spec voltage for your specific DIMMS?
a b V Motherboard
a b K Overclocking
February 6, 2009 12:14:17 AM

Max I have seen the P35-DS3x go is 560Mhz or so.

Btw, it's a CPU limitation not motherboard. The E2xxx serise was quite a bit limited compared to E5200, still 3Ghz+ is more than enough for most people.

Also try F8f BIOS. (Note: F8f is no longer on Gigabyte website, you can find it on the web though)


GUIDE: Overclocking On EP/P35-DS3L
Related resources
February 6, 2009 1:56:49 AM

I know I can't overclock my E2160 over 9x390MHZ = 3.51 GHZ. I think that probably was the upper limit of my E2160. But I lower my CPU multiplier to 6x so I can see how far I can push FSB freq. Since 6x391MHZ(2.33GHZ) is much less than 3.51 GHZ, I would think my cpu can easily take that unless it auto-picks 9x multiplier at boot time? E2160 has 6x, 7x, 8x, and 9x multiplier. From what read about overclocking, do we want to maximize FSB freq as much as possible while keeping CPU and Memory from reaching its upper limit?

In my test, I thought I kept my CPU at 2.33 GHZ (< 3.51 GHZ) and memory at 2x390 MHZ (< 800 MHZ). So I would think 6x391MHZ should be fine, but isn't. What's wrong with my logic? Is there something that I am not aware of?


Thanks!

-Z
February 6, 2009 6:18:09 AM

Sometimes going up by a single MHz can fail, but going up by a bigger jump (say 25 or 50 MHz) will work.
Also, CPU performance is essentially completely determined by the core speed; FSB won't make a noticeable difference.
February 12, 2009 3:49:17 PM

Shadow703793 said:
Max I have seen the P35-DS3x go is 560Mhz or so.

Btw, it's a CPU limitation not motherboard. The E2xxx serise was quite a bit limited compared to E5200, still 3Ghz+ is more than enough for most people.

Also try F8f BIOS. (Note: F8f is no longer on Gigabyte website, you can find it on the web though)


GUIDE: Overclocking On EP/P35-DS3L


I was curious why you recommend F8f bios compared to the F8 or F9(beta) BIOS, was there anything in particular that was different, or behaved differently?

EDIT* I think I found the answer, is it with the whole 400MHz FSB issue? Thanks.
February 13, 2009 5:56:35 AM

Ok, I found out why. As others suspect, It's CPU's limitation. P35-DS3L is great. I have nothing, but good things to say about it. It doesn't have FSB wall at @391 Mhz.

I recently bought Q6600 to replace my E2160(@3.51). Q6600 works fine @391 Mhz and even @400 Mhz. I haven't tried anything beyond 400 Mhz FSB yet. Since It's already OCed at 3.6 Ghz, I'm very happy with it.

To my surprise, 8MB cache of Q6600 has huge impact on gaming and much faster than E2160 at the same oced speed say @3.51 Ghz.

Here is old 3DMark 2001 benchmarking results with AMD's HD4850 video card:

Q6600 @3.60 Ghz -> 58129 points
Q6600 @3.51 Ghz -> 56500 points
E2610 @3.51 Ghz -> 43500 points
Q6600 @2.40 Ghz -> 41000 points

-sharpT
a b V Motherboard
a b K Overclocking
February 13, 2009 11:21:06 AM

bildo123 said:
I was curious why you recommend F8f bios compared to the F8 or F9(beta) BIOS, was there anything in particular that was different, or behaved differently?

EDIT* I think I found the answer, is it with the whole 400MHz FSB issue? Thanks.

Yes. And voltages are more stable with F8f.
July 14, 2009 1:46:58 AM

Awesome sharpt, and thanks for the benches. I can confirm this- my E2200 has a limit at around 400MHz. I'm also using a P35-DS3L.

Although I've made it run at even 440 FSB with the lowest multiplier of of 6 (unstably), it definitely does not want to work around 400 MHz FSB and beyond. This confused the hell out of me, because it doesn't make much sense..

My testing with the E2200 is that it will sometimes work at higher FSB speeds if I do strange things like increase the PCI-E voltage (this worked at 440x6 with a memory:FSB ratio of 1:1), or at one time with an older BIOS I manually set the lowest possible tRD setting of 6 (at 400x7 with memory at a 1:1 ratio). The results also seemed to be different with different BIOS revisions, which makes me ponder if this is a marketing ploy.
Anonymous
a b V Motherboard
a b K Overclocking
November 5, 2010 11:25:03 AM

After 2 years of standard clocks i realized i need oc... with my c2d E8400 9x333 default i hit same or similar ceiling (390 works, 400 no boot, multiplier lowered) on my ga-g33-ds3r. I did not try to go higher though (+25,+50mhz), thats a good tip, ill try that. But I don't want to hear that "it's the cpu" since this cpu is supposed to be oced :) . It seems to me an mb/bios/deliberate limit issue, because this bios also lacks eist control (w or w/o ctrl-f1). Currently im going 9x390=3.5ghz and my target was 3.6 so ill probably just settle with that until next upgrade...
November 5, 2010 11:58:52 AM

Quote:
After 2 years of standard clocks i realized i need oc... with my c2d E8400 9x333 default i hit same or similar ceiling (390 works, 400 no boot, multiplier lowered) on my ga-g33-ds3r. I did not try to go higher though (+25,+50mhz), thats a good tip, ill try that. But I don't want to hear that "it's the cpu" since this cpu is supposed to be oced :) . It seems to me an mb/bios/deliberate limit issue, because this bios also lacks eist control (w or w/o ctrl-f1). Currently im going 9x390=3.5ghz and my target was 3.6 so ill probably just settle with that until next upgrade...


Sounds good to me, plus you'll want to consider the dimishing returns on a power/productivity ratio, basically the last I recall you go, the speed remains linear, but power consumption is somewhat exponential, at least towards the higher clocks. BTW I've been doing 3Ghz solid since that post almost 2 years ago. That just appeared to be the golden spot, any higher and the voltages had to come way up.
a c 156 V Motherboard
a c 197 K Overclocking
November 8, 2010 10:04:00 PM

anonymous, the G31/G33/G41 are economy chipsets. With few exceptions, they are limited to around 350 MHz.
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