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High multi or low multi?

1442 Views 35 Replies 6 Participants Last post by  yasha32, 
yasha32
i was just wondering what would be better for overclocking my 3200, a 10x multiplier or a 9x multiplier with higher FSB\\HTT settings. are there any advantages to lower multipliers? (higher or lower overclocks etc?)
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yasha32
come on... bump bump bump, shake that junk.....lol
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Lower multi and higher FSB will result in increased memory bandwidth. However, you will need to lower HTT in order to keep the result below 1000 (FSB x HTT < 1000). Few applications see a difference between the two. Only RAM intensive programs like Photoshop really benefit.
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yasha32
ok, thanx for the help. will a lower multiplier allow me to overclock more at all?
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A lower multilier will enable you to raise the bus frequency even higher without pushing the CPU too far. This really only helps to overclock the ram.

Depending on how high you ram can overclock, you might try finding your CPU's maximum overclock first, and then use a combination of lower multi/high HTT until your ram reaches it's peak. This will give you your optimum overclock.

If your ram cannot achieve high clock speeds then lowering your multiplier will have no affect and may hurt your performance if you have to use a memory divider.
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yasha32
my ram maxes out at around 510 and the CPU can go up to 2.9 OCCT stable and 2.8 PRIME95 stable. ill try screwing around with the seettings like u said. thanx for the help!
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Quote:


Originally Posted by yasha32

my ram maxes out at around 510 and the CPU can go up to 2.9 OCCT stable and 2.8 PRIME95 stable. ill try screwing around with the seettings like u said. thanx for the help!

If you know how each of your individual pieces perform, use Gogar's Tool for best system settings...
http://math.gogar.com/athlon64.cgi
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yasha32
thats a bad ass little tool, i bookmarked that. anything else i should know about that i probably dont?
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Quote:


Originally Posted by yasha32

my ram maxes out at around 510 and the CPU can go up to 2.9 OCCT stable and 2.8 PRIME95 stable. ill try screwing around with the seettings like u said. thanx for the help!


That's about 250MHz "FSB" for 1:1 . I don't think lowering your multi is going to help much. What's your FSB set it now?

BTW what CPU do you have?
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yasha32
right now my fsb is set to 302 with a 9x multiplier and a ram divider that puts it at about 226. im screwing around with lower multiplier to see if it helps any

EDIT accidently put wrong info, CPU is a 3200
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Quote:


Originally Posted by yasha32

right now my fsb is set to 302 with a 9x multiplier and a ram divider that puts it at about 226. im screwing around with lower multiplier to see if it helps any

EDIT accidently put wrong info, CPU is a 3200


If you have to use a ram divider then lowering your multi just to increase FSB won't do you any good. Just wondering why are you trying to raise your FSB?

There is no benefit of a higher FSB/lower multi if your ram needs to be on a divider. And higher FSB means you will need to keep lowering your HTT frequency mulitlier to not go over 1000MHz.
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yasha32
i thought the closer ur htt speed was to 1000 the better. (302x3)906>825(275X3) those number arent final yet still testing 9x staility
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You want to be close but not go over because this could cause your PC to become unstable. Some ships just like different multipliers and voltages. You will just have to true a few combos and see what works best for your board and CPU.
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Oh, now I see.


The HTT doesn't make that much of a difference. IMO it is better to have in this order:

CPU at it's maximum stable speed
Ram at it's maximum speed
HTT no higher than 1000MHz (not that critical).

So if all you are aiming for is high HTT then you may end up over-overclocking you CPU


So according to you the CPU cannot be over 2.8.

So, 280 FSB, 10X multi, 3X HTT= 2.8GHz, 840 HTT
While, 310FSB, 9X multi, 3X HTT= 2.8GHz, 930 HTT

But remember: CPU>RAM>HTT in importance

Now might find that the 280FSB, while it has a lower HTT might enable your ram to stay closer to it's maximum speed depending on what ram divider you use.

What ram dividers do you have?
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yasha32
thanx a lot, im working to see if my cpu will clock any higher with the 9x multiplier after that ill raise(lower?) the dividers to see how fast the memory will go.
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Ram didvers of Gigabyte boards look like this:

2/2, 2/1.83, 2/1.66, 2/1.5, 2/1.33, 2/1.
<--lower FSB/higher FSB-->
(1, 1.09, 1.20, 1.33, 1.50, 2)

FSB/divider=RAM MHz

You and I both have Gigabyte so it's probably the same.

If your ram tops out at 510, and your CPU limit is 2.8GHz then:

306 FSB/1.20(2/1.66 ram divider)=255 RAM MHz (DDR510), 2.75GHz (9X), 912 HTT (3X)
280 FSB/1.09(2/1.83 ram divier)=256 RAM MHz (DDR512), 2.80GHz (10X), 840 HTT (3X)

So you see it is a trade-off between max cpu GHz and max HTT. Always choose the CPu over the HTT.
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yasha32
well i just recieved the corsair memory i RMAed last week and my CPU isnt even stable at 9x multi anymore, so im forced to 10x. i dont know my max memory clock of this corsair i got, its the twinx2048-3200c2pt matched pair. ill screw around with it right now. and yes i see what you mean by picking CPU over HTT
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It might be a motherboard/chipset limitation just remember to keep the HTT below 1000 and you should be able to use a 9X multi.

Maybe your motherboard doesn't like the high FSB. Mine doesn't either.
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The HTT of 800-1000
Even at 800 the bus isn't saturated, so anything in that above region is fine.
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yasha32
Quote:


Originally Posted by aweir

It might be a motherboard/chipset limitation just remember to keep the HTT below 1000 and you should be able to use a 9X multi.

Maybe your motherboard doesn't like the high FSB. Mine doesn't either.


but it was fine with the high FSB like a half hour or so ago. now that ive installed the corsair everything changed. corsair is supposed to be overclocking memory, but it overclocks like crap. at least the stuff i get
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