digitalbath Posted September 19, 2020 Share Posted September 19, 2020 (edited) ASUS A7N8X-E with mods for Vcore, Vdd, Vdimm, Vtt Vcore:2,07V; Vdd:1,95V; Vdimm=3,57V; VTT=1,649V; Edited September 20, 2020 by digitalbath Quote Link to comment Share on other sites More sharing options...
TerraRaptor Posted September 20, 2020 Share Posted September 20, 2020 Just curious what vtt is? Is it dram vtt? Quote Link to comment Share on other sites More sharing options...
Tzk Posted September 20, 2020 Share Posted September 20, 2020 @TerraRaptor Yes it is. Atlan1980 (member of hardwareluxx.de) reworked the whole Vdimm feedback loop and developed a Vtt mod for the Asus board. He introduced smaller resistors for the FB loop, swapped the mosfets and coils in the Vdimm regulator and removed a cap in the feedback loop which basically eliminated the Vdimm drop under load. We're now at <50mV drop under load at high vcore. I haven't tried it myself, but it looks like we can push much further now, even with TCCDs. @digitalbath managed to pass a 260Mhz 32M run with 2x512mb TCCDs Link, have a look at the attached PDF on this post: https://www.hardwareluxx.de/community/threads/amd-sockel-a.584473/page-109#post-27664417 1 Quote Link to comment Share on other sites More sharing options...
digitalbath Posted September 20, 2020 Author Share Posted September 20, 2020 I had to lower the dram vtt Voltage to get my AT-6 sticks stable for 250MHz and above. I also recapped my board with solid caps. 1 Quote Link to comment Share on other sites More sharing options...
TerraRaptor Posted September 20, 2020 Share Posted September 20, 2020 3 hours ago, Tzk said: Link, have a look at the attached PDF on this post Yep, digitalbath sent me that link some time ago, thanks guys. The reason I questioned it was vtt level mismatch (50% default) used here. Will test that mod too soon (though smd soldering was always a challenge). 1 Quote Link to comment Share on other sites More sharing options...
Tzk Posted September 20, 2020 Share Posted September 20, 2020 My guess is that we‘re getting some vdimm drop on the sticks which results in a lower(ed) vtt voltage requirement. Ive still to try the newer mods, i havent got any decent dso or analog scope to measure ripple and thus i can‘t test those new mods myself yet... Quote Link to comment Share on other sites More sharing options...
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