DFI LP UT X58-T3EH8 - First bench, bios screens etc

[eva2000]

Exactly, and I don't mean by copying that I just pasted your results
More that I can't get a decent Ram OC on my DFI even after having read up on a lot, including your guide.. I guess I either got a bad board, or simply the wrong memory for the DFI. They have always been very picky about rams, so I might need to try a "real" Tri-Kit next.

More likely just the cpu IMC and ram combination isn't the best maybe ? Only time will tell as more folks try different memory kits as to whether the ram spd/pcb design may effect memory clocks. I assume you already done the memory module musical chairs between dimm slots ?

I have been experimenting with MEM, an observing some strange results. After long and heavy MEM-testing, loose tRAS seams to play a bigger role (bigger than what we are used to on CD2) for MEM-stability at higher BCLK.

I have been testing with 8 instance av 50MB memtest 3.8, and have made these observations:

@4GHZ(211x19) HT:on:
@1266 7-7-7-20 1.65v fails (same with tRAS 21 to 24). I didn't test higher tRAS.
@1266 6-6-6-18 fails (same with tRAS 19 to 29), but tRAS 30 passes

@3.8GHZ (200x19) HT:on:
@1200 7-7-7-20 1.65v fails, but tRAS 21 passes
@1200 6-6-6-18 1.65v fails (same with tRAS 19 to 23), but tRAS 24 passes

Almost all fails accrued in 60% to 70% during the memtest.

Loose tRAS seams to be play a big role on MEM-stability at higher BCLK (at least on my CPU and RAM) and seams to have some effect on Vcore too. After i got it stabilized @1266 6-6-6-30 1.65v, i could prime "pass the kill zone" with 1.32v @4GZ(211x19) Ht:On, with is "several notch" lower than the previous Vcore requirement (1.34v).

Anybody else has observed similar behavior?

tRAS stability sometime is related to lack of vdimm. So if you push vdimm up with lower tRAS do you get more stability ?

OK i figured I would ask a question here based on my overclock, as it seems there are many knowledgeable i7 920 overclockers in this thread

I have an i7 920 (batch # 38B) currently clocked at

4.1ghz (196x21)
http://www.xenshardware.com/images/myi7overclock.JPG

1.375v Vcore
Vdroop disabled
1.39v CPU VTT
1.80v PLL
1.65v RAM
all other voltages are defaults.

Whats weird is I am 100% prime 95 stable at this speed. if I move up even 1 BCLK to say 197, and run prime 95, i will get a BSOD. If I drop my multiplier to 19x, and change my BLCK to say 207 (same clock speed, just higher BCLK) I get a BSOD durring prime 95. What could cause that 1 BCLK to make such a difference? What would I need to do to overclock higher?

2.) also my 21x is on 24/7 in windows. If I run 4 core prime 95, it stays at 21x. If I run 8 thread prime and I watch CPU-Z the multiplier drops to 20x. What would cause that to happen?

I have

Intel i7 920 @ 4100mhz (196x21) @ 1.375v
DFI T3eH8 X58 w/ TR Ultra Extreme 120
6GB 2GBx3 OCZ 1560mhz @ 7-7-7-20
Tagan 1100w Quad SLI PSU
1 Visiontek 4870x2 (800/4000)
Soundblaster x-FI Fatality PCI-E
300GB Velociraptor + 150GB 10,000 rpm Raptor

Also, just to note, I can easily boot at 4.3ghz, but anywhere over 197 BCLK i am no longer prime 95 stable. I can still do everything else like super PI and games and stuff without fail. I have duplicated this across 2 chips (38a and 38b) and 2 boards (DFI x58 and asus P6T) so I almost thing its something setting wise I am doing wrong.

tried bumping CPU VTT and/or VDIMM ?? there's a big difference between booting at a bclk vs super pi/games vs prime95

For air cooled you're probably heat limited so probably asking too much for >4.3ghz prime95 stability or even 4ghz for some i7 920s.


Moving my focus over to 3D benchmarks on DFI UT X58-T3EH8 I've flashed to latest 02/06 beta bios and swapped in my EVGA 9800GX2 stock hsf video card for some 3d benching. Alot more fun now that Rivatuner 2.22 and Voltage Factory app by AwardFabrik can do software GPU voltage adjustments

EVGA 9800GX2 clocks:

• Before default 1.15v GPU = 742/1917/2304 Max
• After 1.24v GPU = 786/1998/2304 so far

New personal bests for 9800GX2

3dmark06 = 26,807
3dmark05 = 36,027

Click 3dmark06 image to see full screen including Rivatuner reported GPU volts







System specs

• Intel Core i7 920 3836A756
• 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 - 02/06 beta bios
• EVGA 9800GX2 stock hsf (removed casing) + 181.22 WHQL Drivers
• 6GB (3x2GB) Corsair TR3X6G2000C7GT Dominator GT DDR3-2000Mhz 7-8-7-20 1.65v
• 750GB Samsung SATAII
• Pioneer DVD-RW
• Silverstone OP1200
• WinXP Pro SP3 full nLite updated hotfixes / Windows 7 beta dual boot