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Lumbermatt

Problems with G-Skill GBLA PC4800

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Hello,

 

I've some problems with my new G-Skill GBLA PC4800 sticks and my nF3 Ultra mobo. My sticks are G-Skill 2x512 GBLA PC4800 TCCD 437.

 

I can't get it running stable with an HTT > 260, but my CPU was stable at 275x10 with my former RAM sticks.

 

To get it work at 260, I have to increase vmem to 2.9V. I've tried with to default timmings (2.5-4-4-8) and other timmings like 3-6-6-12, nothing helps.

 

I run the sticks on the yellow slots as read it in the sticky topic.

 

I would be very happy about any suggestions.

 

Thanks a lot

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I'm running with an Opteron 146 and 2 sticks of 512MB OCZ PC4800 Platinum Elite Edition (TCCD)

Seems to me that the most influential settings for running a high HTT and 2 sticks of 512MB are the 1T/2T settings and Read Preamble and Max Async latency. For Opterons with high HTT i set Read Preamble to 7ns and Max Async to 9ns, and offcourse 2T for a HTT of 260 and above. Also i set vdimm to 2.8v (gives 2.9v) My sticks are rated 2.8v for 300MHz 2.5-4-4-8

 

These are my setting for 10x300 @ 2T

 

bios C19

Orange slots

vchipset 2.8

vdimm 2.8v

Max Memclock 200MHz

1T/2T Memory Timing 2T

Tcl 2.5

Trcd 4

Tras 8

Trp 4

Twr 2

Trrd 2

Trfc 16

Trc 12

Twtr 2

Trwt 4

Tref auto

Twcl 1

Max Async latency 8ns

Read Preamble 6ns

Dynamic Idle cycle counter 64

DDR output driving weak

DDR DQ Drive strength 50% reduction

Bank Interleave enabled 2-way

 

These are my setting for 9x325 @ 1T

 

bios C19

Orange slots

vchipset 2.8

vdimm 2.8v

Max Memclock 166MHz using 6:5 divider

1T/2T Memory Timing 2T

Tcl 2.5

Trcd 3

Tras 7

Trp 3

Twr 2

Trrd 2

Trfc 16

Trc 12

Twtr 2

Trwt 4

Tref auto

Twcl 1

Max Async latency 9ns

Read Preamble 7ns

Dynamic Idle cycle counter 128

DDR output driving weak

DDR DQ Drive strength 50% reduction

Bank Interleave enabled 2-way

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Hey Lumbermatt, I'm running this memory on a NF4 sli-dr. Don't know how much help I can be but here are my settings. I am running 4x512 but my setup has same timings with 1gb or 2gb in it. I would go for the orange slots and try these settings:

 

Orange slots

vchipset 2.8

vdimm 2.8-9v

200 1/01

1T/2T Memory Timing 2T

Tcl 2.5

Trcd 4

Tras 8

Trp 4

Twr 2

Trrd 2

Trfc auto

Trc 7

Twtr 2

Trwt 3

Tref auto

Twcl auto

Bank Interleave enabled 2-way

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I had the same problem so to speak with my G.Skill PC3200 FX chips. I could run those no sweat at 280 1:1, on a Neo2, or my Gigabyte K8Ns. It will run the ram at 280 on my DFI, however at boot, I lost my floppy drive/go figure. I tried 705 Bios,( of which for me is the most stable), as well as 711/824/C19.

 

As soon as I took the TCCD out, my floppy magically reappeared. Also of note, I did try in both the orange and yellow slots, no change there, as well as tried different voltages.

 

Here are the settings I ran the TCCD on with the DFI;

 

tcl; 2.5

trc; 11

trfc; 14

trcd; 3

trrd; 2

tras; 5

trp; 3

twr; 3

twtr; 2

trtw; 3

tref; 200mhz 3.9us

twcl; 1

 

Read/Write Q Bypass; 8x

Controller Mode 128 bit

ECC Mode Disable

2T Timing Disable

Bypass Max 4x

Max Async Latency 7Ns

Read Preamble 5.5Ns

Idle Cycle limit 16

Dynamic Idle Cycle Counter Enable

MEMCLK Frequency 200

Drive Strength Normal

32 Byte Grnaularity Disable

 

A few of the settings were default of the board/bios/s, however it did pass memtest tests 5 and 8 at 280htt.. go figure.

 

Hope this helps.

 

Larry

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Okay, with a lot of experiments I got a 290 HTT "relative" stable. I'm exhausted, I just ended to write down all timings, I'm going to test them out tomorrow.

 

Thanks a lot, i will post some updates on this topic.

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