DDR3-2400 RAM won't operate at 2400MT/s, only 1600MT/s

[ZyMOS]

I just got some DDR3-2400 RAM, but it fails to operate at any rate above 1600MT/s

RAM:

• https://www.teamgroupinc.com/en/product/vulcan-ddr3
• DDR3 2400: CL11-13-13-35 1.65V
• DDR3-2400（PC3-19200）
• Tested Voltage 1.50V / 1.65V
• Intel XMP V1.3

Motherboard:

• Asus P6T - LGA1366
• https://www.asus.com/us/supportonly/p6t/helpdesk_manual/

Test Performed:

1. Motherboard Default: 1066MHz
   1. works fine, OS loads and runs fine
2. Ai Overclock turner, set to: X.M.P.
   1. Setting that we automatically set
      1. 2400 -10-13-13-35-2N-1.65-1.2V
      2. BCLK freq: 133
      3. PCIE freq: 100
      4. DRAM freq: 2400
      5. QPI/DRAM core voltage: 1.2
      6. DRAM bus voltage 1.66
      7. RAS/ACT: 3
   2. Result: complete failure, bios doesn't load, just fan turns on
3. Ai Overclock turner, set to: D.O.C.P.
   1. Setting that we automatically set
      1. 1805MHz-9-9-9-24-2N
      2. BCLK freq: 150
      3. PCIE freq: 100
      4. DRAM freq: 1805
      5. Ratio: 18
      6. QPI/DRAM core voltage: 1.2
      7. DRAM bus voltage 1.9 i switched it down to 1.66
   2. Result: BIOS loads, but gives a odd Boot Block Error and tries to find a bootable device, even though everything boots normally with default setting
4. Ai Overclock tuner: Auto
   1. Manually set DRAM freq: 2400
   2. Result: failed to boot
5. Ai Overclock tuner: Auto
   1. Manually set DRAM freq: 2133
   2. Result: boots memtest86+ but crashes and reboots immediately
6. Ai Overclock tuner: Auto
   1. Manualy set DRAM freq: 1871
   2. Result: boots memtest86+, and runs but gives many errors on various addresses. OS runs but gives many segment faults and crashes
7. Ai Overclock tuner: Auto
   1. Manually set DRAM freq: 1600
   2. Result: boots memtest86+, and runs normally, no errors. my OS runs normal

Any advice. Should i buy a different 2400 RAM? If not, Can I buy some more 1600 RAM and mix it successfully? That should work in theory, but.....


thanks

 

[Mr.Scott]

Ram is no good if it fails memtest at advertised speeds and timings.

 

[ir_cow]

1600 MHz = 3200 MT/s (DDR3-3200). Not sure much of anything can run DDR3 at 3200. I'm think your confusing MT/s and MHz here. DDR3-2400 would be 1200 MHz.

 

[freeagent]

I would go to at least 1.4v QPI if you are still around the 1.2v mark.

But.. You want to run at least 3 sticks for triple channel, since that was its intended operation, it will smoke dual channel for sure.

 

[ZyMOS]

1600 MHz = 3200 MT/s (DDR3-3200). Not sure much of anything can run DDR3 at 3200. I'm think your confusing MT/s and MHz here. DDR3-2400 would be 1200 MHz.

Yes, my mistake. Allot of places seem to incorrectly use them interchangeably, and got me.

I would go to at least 1.4v QPI if you are still around the 1.2v mark.

But.. You want to run at least 3 sticks for triple channel, since that was its intended operation, it will smoke dual channel for sure.

tried upping the QPI voltage, no chage.

Ideally ill fill up all 6 of my slots, i just dont want to buy all 2400 if i cant use them

found this thread.

Help getting my DDR3 2400 memory to run at 2400MHZ!

Hi. I have an i7 920 @ 4410MHz. Last week I bought new RAM G.Skill Trident X DDR3 2400 PC3 CL10. The thing is that it's running at 841.3MHZ...

forums.guru3d.com

seems to imply I just cant get it up to that speed,
btw my cpu is Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
if that maters

 

[GerKNG]

2400 is not easy to run with more than 1 dpc.

 

[Count von Schwalbe]

BCLK 133?

As in, processor base clock? Idk if that is the problem, but that doesn't seem right to my tired brain.

 

[yapfei]

DAMM expecting a Socket 1366 era CPU to run at 2400 MHz ?

WAIT for the usual GURU to advise u[date BIOS

 

[freeagent]

BCLK 133?

That's stock. 200 is ok to daily..

 

[oinkypig]

highest i got on asus p6t deluxe v2 w/ 1366 x5675@ 4.8ghz with g skill trident 2400 mhz ddr3 (2x8gb) was at 2095Mhz. Timings were something like 10-10-10-20 @ 2095mhz
cpu pll to 1.8 or 1.9v and qpi/dram voltage to 1.35 or 1.4v. dont go above 1.4volts. x58 doesnt support 2400mhz. Select few boards have seen to go above 2000Mhz.

https://hwbot.org/image/2223168.jpg

https://hwbot.org/image/2706282.jpg

 

[yapfei]

The Integrated Memory controller for any i7 socket 1366 only officially support RAM speed of 800 or 1066 MHz


Based on CPU-Z screenshot, the RAM speed is 1066 MHz based on the fact that FSB/RAM ratio 2 : 10

FSB speed 213 MHz DDR3 1070 MHz around 2 : 10

=============================================
my bad DDR3 is double rated RAM so around 2100 MHz is correct

 

[kiriakost]

x58 doesnt support 2400mhz

This is a fact, and I do wonder if OP ever read the user manual?
6 x DDR3 2000(O.C.)/1866(O.C.)/1800(O.C.)/1600(O.C.)/1333/1066

 

[ZyMOS]

o well... if i bought 4x 4gb DDR3-1600, and mix with the current 2x 4gb ddr3-2400... any reason the system wouldn't run the mem at 1600

 

[freeagent]

or any i7 socket 1366 Xeon

Fixed that for ya

Now, whether or not X58 supports 2400 or now is not a big deal. The board will do it or it wont. I had a UD5 that I got to 1100 with ease on 3 sticks, but not so much with my Asus.

 

[kiriakost]

o well... if i bought 4x 4gb DDR3-1600, and mix with the current 2x 4gb ddr3-2400... any reason the system wouldn't run the mem at 1600

The reason is specific technology specifications.
Adjust manually in BIOS, memory settings and latency clocks for DDR3-1600, and as for DDR3-2400, there is a chance this to follow as to was DDR3-1600.
(compatibility mode and test)
If it fails, remove it.