cant run RAM at 1T :((

[Ringwraith]

specs as in sig...
my problem is i cant change the command rate to 1T .... applications start giving errors when i do .....i have kingston value ram (512*2) 3-3-3-8 (2t) timings.
already updated to the latest bios release ...any pointers?

[delhibhai1000]

think thats d prob wid winchesters.. they cant accept anything less that 2T..

[Ringwraith]

winnies run at 1T when using two memory modules...at DDR400
on populating all four mem slots using double sided modules the memory controller cant run@2T at 400 MHz (fixed in the venice and above cores..)

[teknoPhobia]

What are these 1t/2t timings? my starlite(Hynix d43) ddr400 modules run at 1t memory timings with 95% efficiency, at 2t with 83% bandwidth efficiency

[deathvirus_me]

wtf ??? i get a better efficiency with timings set to 2T from the bios than 1T ... btw i use pc2100 modules ... and also a better 3dmark05 score with 2T than 1T .....

[Ringwraith]

Originally Posted by deathvirus_me

wtf ??? i get a better efficiency with timings set to 2T from the bios than 1T ... btw i use pc2100 modules ... and also a better 3dmark05 score with 2T than 1T .....

do u have an intel ? on intel cpu + mobos RAM timings dont play as much role...since the A64 has an on chip memory controller it likes tight timings much better...
1T is quite faster than 2T (around 1000MB/s difference in bandwidth @ 400MHz)

[teknoPhobia]

But I still don't get what these 1t/2t memory timings are.....

[Ringwraith]

well read it up urself if u have the tempo for it http://www.dfi-street.com/forum/showthread.php?t=11397

basically its the time(clock cycles) the memory controller waits before issuing another command (read/write) to the RAM chip ...
in 1T mode (u can set it in the bios-->ram timings/latency settings ) a command can be issued faster resulting in greater memory bandwidths..

[AlienTech]

Has anyone actually themselves measured this? 1T/2T and other ram timings except MHZ rating should not show a greater than 10% difference between the tightest to the loosest... You need the loosest for max overclocking... So a 400MHZ DDR with 100% efficiency should give around 6000MB/Sec transfer rates... In the very best cases which is not possible... Normal is around 4500MB... IE 4000 for the loosest with 5000 being the tightest ratings... Difference between 1T and 2T is less than 2%.

[teknoPhobia]

Single channel DDR 400 has a max theoretical bandwidth of 3.2 gbps. Mine hits 3.040 at 1t timings. Dual channel has a max theoretical bandwith of 6.4 gbps but the efficiency suffers a lot and the max i've ever come across is about 5.6 gbps. I don't know from where you got those numbers

[AlienTech]

Thats intresting because
CPU CPU Clock Motherboard Chipset Memory Read Speed
Athlon64 3500+ 2200 MHz MSI K8N Neo2 Platinum nForce3-Ultra Dual PC3200 DDR 6030 MB/s

CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Latency
Athlon64 3500+ 2200 MHz MSI K8N Neo2 Platinum nForce3-Ultra Dual PC3200 DDR 2-2-2-5 45.6 ns


Which is close to the theoritical max.

Mine is only

CPU CPU Clock Motherboard Chipset Memory Read Speed
Athlon64 1700 MHz MSI RS480M2 (MS-7093) RS480 Dual PC3200 DDR 4576 MB/s

CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Latency
Athlon64 1700 MHz MSI RS480M2 (MS-7093) RS480 Dual PC3200 DDR 3-3-3-8 59.5 ns

[Ringwraith]

i get scores of 5600 mbs/ sec on my nf4 sli chipset...this is when running@ 2.5-3-3-6 2T ... running on 1T would give me scores closer to the theoretical max i believe....

[AlienTech]

Originally Posted by Ringwraith

i get scores of 5600 mbs/ sec on my nf4 sli chipset...this is when running@ 2.5-3-3-6 2T ... running on 1T would give me scores closer to the theoretical max i believe....

At 200MHZ FSB?

You might have problems with 2.5-3-3-6 @ 2T, you could try 2-3-3-6 @ 1T or 2.5-3-3-7 @ 1T. Maybe even 2.5-3-3-8 @ 1T. Those are some tight timings for over clocking.

[Ringwraith]

yeah 200 fsb...5600 mb/s read speeds and 2100 mb/s write speeds (using everest benchmarks)...
i tried very loose timings even 3-5-5-10 1T but memtest always fails at anything below 2T command rate