First i7 920 D0 Step @4710Mhz HT Enabled

[eva2000]

Yes not as good as other i7 920 D0 steppings in terms of vcore needed - but runs alot cooler than alot of D0 even with high vcore applied

Pushing my i7 920 3851A368 D0 to the max with HT enabled now. Seems cpuz validation is higher than my i7 920 3836A756 C0 when HT enabled - 4710mhz vs 4669mhz and D0 also has slightly higher max HT Enabled Super Pi 32M cpuz speed - 4685mhz vs 4618mhz. Only difference is for C0 tests I used single 8800GT while D0 was using 2x HD4870x2 Crossfire installed.

Like my C0 stepping, this D0 seems to handle high vcore with relatively low temps !!!

System:

• i7 920 3851A368 D0 stepping
• EK Supreme LT 1366 / FESER 480 / MCP655
• DFI UT X58-T3EH8 04/28 beta
• 2x HD4870x2 Crossfire (Powercolor + Gigabyte flashed to Asus Top bios) with ATI Win7 9.4 (8.612 WHQL)
• 6GB Corsair Dominator GT DDR3-2000Mhz 7-8-7-20
• 750GB Samsung SATAII
• Silverstone OP1200 PSU
• Triple boot - WinXP Pro SP3 / Vista Ultimate 64Bit SP2 / Win7 Ultimate 64bit RC

From http://i4memory.com/111898-post6.html

i7 920 3836A756 C0 TRUE120 Air

• Max 32M Super Pi = 4473Mhz HT enabled / 4652Mhz HT disabled
• Max Validation = 4473Mhz HT enabled / 4769Mhz HT disabled

i7 920 3836A756 C0 EK Supreme LT / Feser480 H20

• Max 32M Super Pi = 4618Mhz HT enabled / 4680Mhz HT disabled
• Max Validation = 4669Mhz HT enabled / 4744Mhz HT disabled

VS

i7 920 3851A368 D0 EK Supreme LT / Feser480 H20

• Max 32M Super Pi = 4685Mhz HT enabled / TBD HT disabled
• Max Validation = 4710Mhz HT enabled / TBD HT disabled

[eva2000]

All benchmarks done in Win 7 Ultimate 64bit RC.

@4710Mhz at 1.64v





@4685Mhz at 1.616v



@4643Mhz at 1.584v



@4560Mhz at 1.536v

[systemviper]

Hey great info, love the possibilities,

I see u have 3 OS's, which do you find i best for benching, vista 64 or win7

I just got win7 RC and have been using Vista 64 for a while now and like it, but was wondering
your opinion. Again thanks for your posts , always good info

[leejsmith]

I am also very impressed with the do stepping 920's

p6t
ocz 1333 6bg kit
running at 200x20 for 4ghz
air cooled

the SLBCH c0 stepping i have does this at 1.3v 75C max core temp

the first d0 stepping i put onto the same rig with same bios settings is running at 1.175v so far and it's prime stable at 68C max.

[eva2000]

Hey great info, love the possibilities,

I see u have 3 OS's, which do you find i best for benching, vista 64 or win7

I just got win7 RC and have been using Vista 64 for a while now and like it, but was wondering
your opinion. Again thanks for your posts , always good info

Thanks

for super pi 32m winxp > win 7 > vista. But i do all my initial stress testing in win7 64bit rc before xp since it can tackle all 6GB of ram in tests

I am also very impressed with the do stepping 920's

p6t
ocz 1333 6bg kit
running at 200x20 for 4ghz
air cooled

the SLBCH c0 stepping i have does this at 1.3v 75C max core temp

the first d0 stepping i put onto the same rig with same bios settings is running at 1.175v so far and it's prime stable at 68C max.

nice what batch number for both your c0 and d0 ?

[leejsmith]

Thanks

for super pi 32m winxp > win 7 > vista. But i do all my initial stress testing in win7 64bit rc before xp since it can tackle all 6GB of ram in tests


nice what batch number for both your c0 and d0 ?

C0 3843A848

D0 3845b071

The D0 needed 1.215 to enable turbo and run prime 95 bumped temps upto 72C

just ran the another D0 3845b071 and that failed to post with the same settings as the first one so i know which one i am going to use.

[eva2000]

thanks - 3845b are very good batches!!

my d0 ain't that great but runs cool

lets see how this i7 920 3851A368 D0 handles memory clocking with 10x memory multiplier. First stop at DDR3-2000Mhz 7-8-7-20 1T at 1.65v

Room ambient temp = 25-26C

• Win 7 Ultimate 64bit RC OS used
• Powermate wattage meter reads peak system power consumption of ~620 watts drawn from wall

Linx 0.5.8.2 Load



Linx 0.5.8.2 5pass



System:

• i7 920 3851A368 D0 stepping
• EK Supreme LT 1366 / FESER 480 / MCP655
• DFI UT X58-T3EH8 04/28 beta
• 2x HD4870x2 Crossfire (Powercolor + Gigabyte flashed to Asus Top bios) with ATI Win7 9.4 (8.612 WHQL)
• 6GB Corsair Dominator GT DDR3-2000Mhz 7-8-7-20
• 750GB Samsung SATAII
• Silverstone OP1200 PSU
• Triple boot - WinXP Pro SP3 / Vista Ultimate 64Bit SP2 / Win7 Ultimate 64bit RC

5 passes not enough? How about 20 passes + 3dmark06

Room ambient temp = 23.5-26C

• Win 7 Ultimate 64bit RC OS used
• Powermate wattage meter reads peak system power consumption of ~628 watts drawn from wall

Linx 0.5.8.2 Load



Linx 0.5.8.2 20 pass

[leejsmith]

P6t Dlx
ozc 3gb 1600 kit
tagen tg530u-15 psu
Xspc delta v3 17 block
ddc 355 pump
feser xchanger 120 rad
xspc 240 rad

[ColonelCain]

eva, what do you have your PCI-E frequency set to in the BIOS when you are going for these kinds of high(ish) BCLK's?

[eva2000]

nice leejsmith - much nice cpu for vcore requirements than mine

for up to 228bclk, PCI-E between 100-104mhz. For 230-235bclk, PCI-E 110mhz.

[lior307]

Good Info My friend ,
Did you Tried Playing with the PCI-E (112MHZ - 115MHZ)
It should give you about 2-5 more BCLK .

[Boogerlad]

i'm a noob, but i thought that i7 920's multi was 20? how did you get 21?

[INFRNL]

^^^ turbo enabled brings to 21x

[Boogerlad]

even idle doing nothing?

[jcniest5]

i'm a noob, but i thought that i7 920's multi was 20? how did you get 21?

On most OCable board, they allow you to choose 21 as the multiplier as well.

[eva2000]

Good Info My friend ,
Did you Tried Playing with the PCI-E (112MHZ - 115MHZ)
It should give you about 2-5 more BCLK .

running 4870x2 cf so limiting how far i can push pci-e frequency hehe - with single 8800GT can run up to 115mhz pci-e but didn't help much but that was with c0 not d0 stepping cpu

even idle doing nothing?

yup as long as you don't trip TCP/TDP and TM protection limits or disable them in bios.. tip #3 at http://i4memory.com/102537-post3.html for DFI UT X58-T3EH8

[masska]

Good info as usual Eva . Although DO's seem to go better it’s interesting to see the variances between the batches.

[The-Fox]

Very nice results George
Yo had a really exceptional C0 chip, so your gap is not that big with the D0.
I had a good c0 chip and the gap for me was huge, it goes to 4650Mhz easy as pie.

Currently managed to push it all the way to 4740Mhz (on Water, see my signature) though still limited by the board.

P.S.
You need to polish up your Spi32M result
My currently SuperPi 32M record (the Bloodrage is seriously a fast board):

[dinos22]

george was using vista- hence not really even attempting at tweaked runs i dont think


p.s. you call that a polished run do ya

[eva2000]

Yeah vista and win7 are around 10-20 seconds slower clock for clock than xp. I'm running win7 just for stress testing before moving to winxp. IIRC on winxp my 32m pi time is around 7min 46s @4620-4650mhz so about around that mark. I suspect 4685mhz 32m pi in xp OS would be around 7min 40-44s without copy waza etc.

[dinos22]

vista is not that much slower

[The-Fox]

My run includes most tweaks (some service disabled, RAM Drive, Maxmem and large cache), no Copy WAZA/CDT were performed, I never get them to be working properly

[DJSUB]

i'm the 2nd?

[Pt1t]

it seems that 51A needs more vcore than earlier FPO.... 975 also

[The-Fox]

Yes it does Pt1t.
I compared 3850A795 to 3851Axxx and whatever the 3850 did, the 3851 needed 0.1v more to accomplish, it was like that all the way up to 4.4Ghz, I don't how it scales on higher speeds.
I don't know if it is going to keep that way, we will have to wait (for newer steppings) and see.