Tom's Hardware > Forum > Overclocking > General Discussions > New OC passes small FTT, but fails Blend in prime95, whats the Culprit

New OC passes small FTT, but fails Blend in prime95, whats the Culprit

Forum Overclocking : General Discussions - New OC passes small FTT, but fails Blend in prime95, whats the Culprit

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cmf0106   10-13-2008 at 01:17:59 AM

First thank you for taking the time to check this.

 

I am currently running with these settings trying to achieve a 3.8 OC on my q9550 (stock 2.8).

 

FSB- 1800
CPU-8.5x
Link and Synced
5-5-5-15-2T

 

CPU- 1.375v
FSB-1.325v
mem-2.1v
SPP-1.45v
MCP-1.6v
SPP-MCP- 1.4v

 

Idle temp: 38
Load temp: 55

 

With this the system performs marvelously in Prime95's small FTT stress test. But when I try to run a prime95 Blend test, it only
lasts about 3 minutes until encountering a fatal error typically on thread 2 or 1. The error reads "fatal error rounding was .5,
expected less than .4"

 

System Specs:
Intel Q9550 2.8
Heatsink: Tuniq Tower
EVGA 780i SLI FTW
Nvidia GTX 280 x2 SLI
G.SKILL 4GB (2 x 2GB) DDR2 @ 1066
SILVERSTONE OP1000-E 1000W ATX 12V 2.2 & EPS 12V
Windows Vista 64 bit


Message edited by cmf0106 on 10-13-2008 at 01:44:51 AM
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spathotan   10-13-2008 at 01:37:03 AM
- 0 +

How long did you run the smallfft test?

------------------------------ http://valid.canardpc.com/cache/banner/547515.png
Intel Xeon X3370 @3.6ghz Under Enzotech Extreme-X,EVGA GTX 285 SC, 4GB Mushkin Ascent eVCI @ 1066mhz, Gigabyte P45 UD3P
 Reply to spathotan
cmf0106   10-13-2008 at 01:45:11 AM
- 0 +

About an hour, but thats alot longer compared to the 3 minutes it lasts on blend

Reply to cmf0106
spathotan   10-13-2008 at 03:51:39 AM
- 0 +

Hmm. Try upping the voltage by 1 notch.

------------------------------ http://valid.canardpc.com/cache/banner/547515.png
Intel Xeon X3370 @3.6ghz Under Enzotech Extreme-X,EVGA GTX 285 SC, 4GB Mushkin Ascent eVCI @ 1066mhz, Gigabyte P45 UD3P
 Reply to spathotan
cd14   10-13-2008 at 04:12:26 AM
- 0 +

Blend is stressing the RAM. Back up on your timings. Set it on auto in the BIOS so that it compensates for the speed.

------------------------------ Asus PQ5 Deluxe | Intel Q9550 @4.08 Ghz | Swiftech Apogee Drive, 3 Rad | Ballistix 8500 | ATI 4850 Crossfire | CoolerMaster HAF
 Reply to cd14
vinegarjoe   10-13-2008 at 04:51:05 AM
- 0 +

Yea ram is probably the culprit. You could try running memtest for a few hours to verify that though. Also, 1hr is not nearly long enough for a final say on whether your system is stable or not. You need to go for at least 6-8. Preferably get a 24hr test in there as well.

------------------------------ 3 quasihurtz Abacus cpu | DIY Postitnote X38 mobo | nVISBL INK7600 FX | Antique 900 YR Case | AC/DC Radioheadache PSU | DDT5 800 Pesticide RAM | 52yr Old Scribe Burner | Twice Blue, Ray Charles Player | 7.1 Sandblasted Stereotype System
 Reply to vinegarjoe
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