DFI LT X48-T2R Review

I should have a full BIOS guide up soon over at Anandtech if anyone is interested. Just finalizing a few new things we are trying out now. The GTL scales can be a little off in places, so I will probe out some key points and make a few tables if needed. Dual 45nm's do not need much VTT at all. The 45nm quads scale at default VTT upto around 420 fsb after which the VTT - GTL tuning requirement is non linear every 10 FSB increment. Topping out 440 if voltages are to be kept safe. For the quads sticking to 400 fsb running an applied tRD of 6 with some of the phase shifts applied to 5 is the best operating point. For dual 45nm's getting to 500FSB is quite easy with a little bit of care - I am currently at 4GHz/500FSB with 4GB of OCZ Flex 9200 at 1200mhz with low Vdimm. I use a DMM to set my base GTL starting point using a single reference for ground. I appreciate this is not something everyone will want to do, so I will map out the percentage points if needed.

regards
Raja
 
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raja said:
I should have a full BIOS guide up soon over at Anandtech if anyone is interested. Just finalizing a few new things we are trying out now. The GTL scales can be a little off in places, so I will probe out some key points and make a few tables if needed. Dual 45nm's do not need much VTT at all. The 45nm quads scale at default VTT upto around 420 fsb after which the VTT - GTL tuning requirement is non linear every 10 FSB increment. Topping out 440 if voltages are to be kept safe. For the quads sticking to 400 fsb running an applied tRD of 6 with some of the phase shifts applied to 5 is the best operating point. For dual 45nm's getting to 500FSB is quite easy with a little bit of care - I am currently at 4GHz/500FSB with 4GB of OCZ Flex 9200 at 1200mhz with low Vdimm. I use a DMM to set my base GTL starting point using a single reference for ground. I appreciate this is not something everyone will want to do, so I will map out the percentage points if needed.

regards
Raja
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That will be handy. When are you likely to post it? My board arrives tomorrow :):). I caved it couldnt wait for the DDR3 board!

Out of interest which coloured memory slots are the best to use. I remember for the NF4 DFI they said always use orange when overclocking. So for this board is it lime or lemon coloured? :)
 
in a few days hopefully. We are working on a new way to present our stuff which should be very useful to users who are just starting out (can't say too much atm).

Slot wise there is not much variance between green and yellow tbh - as long as the clock skews sense the required delays properly.

regards
Raja
 
kosch said:
Have been playing with the new parts all day and have my E8200 running at 4Ghz although its not quite stable yet.
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Kosch

I had an E8200, try the VTT at 1.2 & all the GTL's at around 70... Thats what I found stable although all the boards & CPU's vary together with your PSU you should find stability around those figures... I'd hazzard a guess between 65 & 75 for all 3 GTL settings ;)
 
Thanks for the tips Monster I'll try it now :)

I can get into Windows at 4Ghz but OCCT errors out after about 30 seconds.

What do the GTL's control? I guess they control voltage for something other than the Cpu/nb/sb?

cheers Kosch
 
What voltage settings are people using for 450+ fsbs? At the mo im running at 450x8 and its stable. But i cant get the board even boot at 460+ :(
 
kosch said:
Hmm a quick bit of reading and from what I can tell you have to try and match the GTL's to what ever you have set the cpu & NB's voltage to. So it ensures the quality/stability of the power?
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Yes, but as I said before boards, CPU's, PSU's etc can vary so they are a guideline at first... I started from the settings in the tables provided by DFI & put this table together which may give you a better idea:

DFIgtlx67x63x61.jpg


But even still the figures in this table are a starting point and not exact!
 
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SpudMaster said:
What voltage settings are people using for 450+ fsbs? At the mo im running at 450x8 and its stable. But i cant get the board even boot at 460+ :(
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I'll post the voltages I'm using when I get home tonight.

But if I remember correctly think I the vcore was 1.275xx which related to 1.31 in CPU-Z. On the E8200 1.36v is the limit you can push through the CPU before you risk frying it.

I had the same problem above 480 FSB and had to push the NB upto 1.5ish.

It was able to POST and get into Windows but would then freeze within a few seconds before I adjusted the NB.
 
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Dfi have a new beta that should be ready next week.. There are a few extra chipset reference voltage levels that Oskar has unlocked and thrown out there. There are some marginal benefits to tuning adjusting these (but it varies from board to board).

I had a word with DFI about their VTT/GTL tables as there are several mistakes in the tables that are currently in circulation. Mainly real VTT levels off whack throwing the whole shebang off centre. There are a couple fo probing points on the board which show local VTT levels at the device in question that I use personally that proabably are not wise for me toshare as you need proper SMT probes to avoid killing the board. However, even with a level of tuning this fine, we have found that two boards will require drastically different GTL levels - especially for the Northbridge.

I have a quick 500fsb video setup guide using 4Gb of memory at 4Ghz on an E8500 - it will be uploaded as part of the review. I kept things uber basic in there just to get people up and running. Still finishing off the article now.

For 500fsb ultra stable make sure you supply adequate VTT. The board will even boot at default VTT and GTL at 495FSB, but requires a real tuning between 1.30 and 1.34v with the duals. Unless you are just benching and not loading the cores real heavy.

regards
Raja
 
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