Abit AV8 & 3rd Eye O'c Thread.

NiteSurfer · 23 Mar 2006 at 11:03

Hi

As I'm new to O'c I would like to ask if anybody on here can help me get the best out of my setup please.

I've got the following.

Abit AV8 & 3rd eye
A64 3800x2 Duel Core.
Arctic cooling pro 64
2GB Geil pc3200 Ram
X850XT Graphics Card
Enermax Liberty 500W power supply.

My settings are this so far.

2.4Ghz @ 1.45V
10x240 multiplier
LDT x4
AGP Locked 66mhz
memory clock 333
Memory timings set by SPD and 1T

P.s I've also upped the NB/SB and HT and ram voltages by a notch

I understand the Hypertransport calculations in regards to FSB, But i'm not sure I understand why my RAM clock is only able to run DDR333 instead of DDR400. Sorry for sounding stupid but I am new to all this.

Your help would be much appreciated.

Thanks

ajgoodfellow · 23 Mar 2006 at 17:05

Hi

When you set your ram clock to DDR400 you're setting the ram to run in sync, that is 1:1 with your HTT speed

As your HTT speed is currently at 245MHz, you're telling your ram to run at 245MHz. As the ram is only rated at 200Mhz (PC3200) it cannot run at these speeds

When you set the ram to DDR333 you're in fact using a divider. When the HTT is set to 200Mhz (stock) then with this divider your ram will be running at 166MHz. As you overclock your HTT speed you're also overclocking your ram

To get a rough idea of what your ram is running at:

Ram speed = HTT x (d/400) where d is the divider (400MHz, 333MHz, 266MHz or 200MHz are the common options).

So, for a divider of DDR333 with your HTT speed running at 245MHz,

Ram speed = 245 x (333/400)

Ram speed = 204Mhz (this is only slightly over the rated speed of 200MHz for your ram so that's why it works without any problems)

In actual case the ram speed will be ever so slightly different to this as it is calculated as a ratio of your current CPU speed (due to the on board memory controller). This is an easy way to work it out though and it gives good results

Hope that helps

NiteSurfer · 24 Mar 2006 at 08:21

That helps a lot, I now understand how it works and a lot wiser for it, thanks for that.

z0mbi3 · 4 Apr 2006 at 09:59

P.s I've also upped the NB/SB and HT and ram voltages by a notch

You don't need to, at all. The majority of people get 250 htt out of this board with no voltage adjustments. Mine does 260 with no voltage adjustment and 280 with the NB up one notch.

It's worth noting that you'll probably have to use either ldt x1 or x2 above 250 htt. LDT x3 is bugged.