Cedar Mill 661

I got my 661 today that is replacing my not-very-OCable 930.

Unlike any Prescot or the Presler I used in this board, this thing overvolts like crazy at idle (.04-.05V over setting). That, more than anything right now is limiting how much Vc I toss at it (1.525Vc setting = 1.56-1.57V idle) and what max OC is. Too bad it still drops to 1.48V on load @ 1.525. I will be reinstalling my vdroop mod tomorrow to better control the Vc. I will also put it on the single stage sometime tomorrow as well.

Note, I wasn't going for scores here, just using PCMark04 for stability testing. Mem was running a weak 5-5-5-15 1:1 to not interfere with the proc OCing. I turned up the mem for SPi, which is the last thing I did tonight. This is with just the CPU on water and it's looking really good so far...

At 1.525Vc, 4914 (273FSB) passes WITH score, 4950 (275FSB) finishes with NO score and 5040 (280FSB) crashes to the desktop. SOOOO close to a solid and stable 5GHz. It probably needs that full 1.55Vc setting which I can't give without running into the 1.60Vc idle range :(

http://i10.photobucket.com/albums/a1..._pc04_4900.gif

4914MHz (273FSB) 1.525Vc
1.56Vc idle
1.48 load
28C idle
50C load

SPi 1M @ 5040 would finish. I am really missing the 14x multi and FSB that the LockFree gave on the 670, but it's OK I guess considering it's 5GHz on water!!!!

http://i10.photobucket.com/albums/a1...1/spi_5GHz.gif

"Suicide shot" if you want to call it that with 1.525Vc. An even 290FSB would lock up.

http://i10.photobucket.com/albums/a1...1/661_5200.gif

Nice to see some Cedarmill action.
Now mount that Chilly1 SS to it :)

I need to put the vdroop mod back on the mobo first to try to get that insane overvolt under control :) I will do that, try again on WC @ 1.55Vc stable to see what it does and then the SS goes on tomorrow afternoon/night.

My Presler scaled like ass on the phase, so I am really hoping this CM responds because it sure is awesome on just water already :D

boostedevo, you can set "CPU lock free" with 661 on P5WD2 ? you know with 14 x multi ?

I WISH, but not on this proc. The CMs and Preslers right now don't even have EIST, C1E, etc, but they will get those features in Q2. I don't know if the real LockFree will be included in the 661/671s at that time too, but I sure hope so. The 671 (~$600) is scheduled for release in April and if it comes out and has LockFree, I'll grab one for sure even with Conroe coming right after it. If this 661 had 12x or 14x multi on it right now, I would be having a benching marathon.

If the lower end CMs clock anywhere this well, a lower default multi would definitely be a blast.

Quote:

---

Originally Posted by IluvIntel

boostedevo, you can set "CPU lock free" with 661 on P5WD2 ? you know with 14 x multi ?

---

No he cannot, thats a common misconception of these chips. No intel B1 stepping core has EIST which means there is no way of going to 14x.

All the new chips are permenantly locked at their maximum speed until Intel fixes the EIST modes on these chips

Nice scores! :up:
Seems that 4500mhz wil be very easy with 6x1 cpus.

Awesome - looks like a great chip here!

Nice ocing! How good are they on air?

Nice job to bad about the lock free though.

speed, yeah if they had LockFree, I'd be looking at 415FSB already and it would be a lot more fun...can't wait to put it on phase.

tonyl, I don't know, I went straight to water. One other member @ OCF that will run on air has theirs (651 IIRC), but can't update his BIOS to run it yet (man, that sucks!). Another *may* have another 661 today, but I am not sure of his cooling plans. It should be pretty darn good either way. Load temps are hanging right around 50C on WC with 1.52Vc/4.9-5GHz. That may easily be 65C or higher on the stock HSF and a little cooler on a good one obviously ;)

Thanks mike!

joe, I am going to say that's probably correct. Mine did 4.3GHz (WC) with default Vc. I would think even if crappy cores (mine could be for all I know) needed 1.40Vc (+.10V over default) to get to the same level, they'd still have some good headroom for 4.5+. I *think* 4.5GHz will be a no-brainer, but I reserve the right to change my mind after I see a couple of 631/641s on air :)

Sen, yeah, I was REALLY hoping it would magically be there (LockFree), but wasn't expecting it without EIST support. It would be SO nice if something as simple as a BIOS change would enabled it, but it's Intel's doing, so I guess that's wishful thinking. One of the CPUID apps I tried (GCPUID) does read the min multi as 12x on it though.

IF (maybe a big if) the slower default CMs clock as well, a 631 or 641 would be a little more fun in the FSB department.

Anyway, I'll update later tonight after I get the phase going on it...