Post your Bclks if you have tested more than 1 Core i7 on the same MB

[tomb18]

A lot of people are wondering where the bclock limit is on the core i7 platform. Is it the CPU itself? or the motherboard?
In my case, I had a 920 and a 940 both 3836A batches and both were limited to 205 on an Asus P6T-D.
It would be good to see what others have found andf perhaps we could determine one way or another..Is it the CPU or the Motherboard.

Please post

[eva2000]

Don't forget memory and motherboard used can effect bclk too :)

Got identical batch i7 920s = 2x i7 920 3836A756 interesting comparison especially how they handle CPU VTT and max bclk!

http://nx.i4memory.com/reviewimages/cpus/corei7/920_3836A756/content/bin/images/large/corei7_920_12.jpg

*** Prime95 ***

i7 920 3836A756 #1

@3815Mhz at 1.232v HT enabled 4+ hrs (my 24/7)
@4009Mhz at 1.328-1.344 HT enabled 1+ hr (my video encoding config)


i7 920 3836A756 #2

@3815Mhz at 1.264v HT enabled ~40mins before system reboot (didn't test further)


*** Max Super Pi 32M ***

Both cpus have similar max air cooled HT enabled 32M Pi ceiling of under 4500Mhz. HT needs to be disabled for greater than > 4500Mhz on air cooling.

i7 920 3836A756 #1

@4300Mhz HT enabled at 1.488v (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_1/corsair/2133c9df_2gb/hton/21x/droopoff/205_1024_99924_1.45_1.725_1.36_13332666/spi32m_8m32s516ms.png)
@4410Mhz HT Enabled at 1.520v (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_1/corsair/2133c9df_2gb/hton/21x/droopoff/210_1050_99924_rfc72_1.4875_1.875_1.48_13332666/spi32m_8m19s344ms.png)
@4554Mhz HT Disabled at 1.552v (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_1/corsair/2133c9df_2gb/htoff/droopoff/21x/217_1084_99924_rfc69_wtp7_1.525-1.965_1.53_075/spi32m_8m01s031ms.png)
@4610Mhz HT Disabled at 1.600v (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_1/corsair/2133c9df_2gb/htoff/droopoff/21x/220_1097_99924_rfc69_wtp7_1.5625-1.965_1.53_075/spi32m_7m54s375ms.png)
@4652Mhz HT Disabled at 1.616v (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_1/gskill_corsair/12800hz80_2133c9df/21x/htoff/droopoff/5xmem/221_1107_99924_rfc78_rtw17_rrd5_rtp6_rc28_faw28_1. 5875-2.025-1.53_0875_12712517/spi32m_7m49s656ms.png)


i7 920 3836A756 #2

@4359Mhz HT enabled at 1.456v (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_2/corsair/dominatorgt/123/21x/dof/4xmem/207_830_78720_rfcA_rwA_rtwA_rrdA_rtpA_rcA_fawA_1.4 25-1.635-1.44_rd15/spi32m_8m21s062ms.png)
@4468Mhz HT enabled at 1.488v (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_2/corsair/dominatorgt/123/21x/dof/4xmem/212_851_78720_rfcA_rwA_rtwA_rrdA_rtpA_rcA_fawA_1.4 5-1.635-1.44_rd15/spi32m_8m09s594ms.png)
@4536Mhz HT Disabled at 1.536v (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_2/corsair/dominatorgt/123/21x/dof/4xmem/htoff_216_864_78720_rfcA_rwA_rtwA_rrdA_rtpA_rcA_fa wA_1.5-1.635-1.5_rd15/spi32m_8m02s766ms.png) * yet to test higher


*** Max BClock ***
Definitely this second i7 920 3836A756 is better than my first one in terms of max Bclock and low CPU VTT usage.

i7 920 3836A756 #1

max memtest86+ bootable bclk = 224 requiring 1.58-1.60v CPU VTT
max super pi 32m bclk = 222bclk (without IOH/ICH voltage tweaks) & 228bclk (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_1/gskill_corsair/12800hz80_2133c9df/18x/hton/doff/4xmem/228_913_99924_rfc88_rtw16_rrd6_rtp6_rc31_faw31_1.3 875-1.905-1.53_05_125120/spi32m_9m00s203ms.png) (with IOH/ICH voltage tweaks) requiring 1.60-1.61v CPU VTT
max CPUZ Validation = 230bclk (http://valid.canardpc.com/show_oc.php?id=483781) requiring 1.60-1.63v CPU VTT


i7 920 3836A756 #2

max memtest86+ bootable bclk = 229bclk requiring 1.40-1.48v CPU VTT
max super pi 32m bclk = 227bclk (http://fileshosts.com/intel/DFI/DFI_UT_X58_T3EH8/results/true120/920_3836a756_2/corsair/dominatorgt/312/19x/doff/4xmem/227_908_78720_rfcA_rwA_rtwA_rrdA_rtpA_rcA_fawA_1.4 5-1.635-1.48_rd15/spi32m_8m20s344ms.png) (without IOH/ICH voltage tweaks) & ???bclk (with IOH/ICH voltage tweaks TBD) requiring 1.48-1.50v CPU VTT
max CPUZ Validation = 231bclk (http://valid.canardpc.com/show_oc.php?id=500973) requiring 1.50v CPU VTT


TBD - Haven't tested 2nd cpu with IOH/ICH tweaks yet

http://nx.i4memory.com/reviewimages/motherboards/dfi/UT_X58_T3EH8/html2/content/bin/images/large/DFI_X58_T3EH8_9.jpg

System specs

2x i7 920 3836A756 #1 and #2
Thermalright Ultra 120 Extreme + LGA1366 Bolt Thru kit + 2x 120x38mm Scythe UltraKaze 2000rpm 87cfm fans in push/pull
DFI LP UT X58-T3EH8 R.A51 (http://i4memory.com/f80/dfi-lanparty-ut-x58-t3eh8-lga1366-photos-bios-overclocking-information-guide-12855/) - 01/23 beta bios
1KW Corsair HX1000 psu
WinXP Pro SP3 full nLite updated hotfixes / Windows 7 beta dual boot