coolyou
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I just upgraded memory to 8gb on my 750i FTW motherboard. The problem that I'm experiencing is the memory, all 4 modules, are registering as 400 mhz rather than 800Mhz. Without the G-SKILL modules installed the OCZ modules will run at 1066Mhz, or 800Mhz or whatever I set it to, but these G-SKILL modules seem to be the problem. New modules: (Working with OCZ) G-SKILL (F2-6400CL5-2GBPQ) 2x2gb: G-Skill claims they operate at 800Mhz. Previous modules: OCZ (OCZ2P10662G) 2x2gb: 1066Mhz; works at 1066Mhz, 800Mhz -- Never had an issue with these modules. Timings: 800Mhz 1:2 5-5-5-15-24-2T | 3-24-5-9-7.8 Physical Memory : 8192 MB DDR2-SDRAM General Information
A0 (RAS 0, RAS 1) : 2048 (Double Bank)
A1 (RAS 2, RAS 3) : 2048 (Double Bank)
A2 (RAS 4, RAS 5) : 2048 (Double Bank)
A3 (RAS 6, RAS 7) : 2048 (Double Bank)
Information SPD EEPROM (A0)
Manufacturer : G Skill
Part Number : F2-6400CL5-2GBPQ
Serial Number : Unspecified
Type : DDR2-SDRAM PC2-6400 (399 MHz) - [DDR2-799]
Format : Regular UDIMM (133.35 x 3)
Size : 2048 MB (2 ranks, 8 banks)
Module Buffered : No
Module Registered : No
Module SLi Ready (EPP) : No
Width : 64-bit
Error Correction Capability (ECC) : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8, Self Refreshµs
Voltage : SSTL 1.8v
Prefetch Buffer : 4-bit
Manufacture : 2000
Supported Frequencies : 266 MHz, 399 MHz
CAS Latency (tCL) : 4 clocks @ 266 MHz, 5 clocks @ 399 MHz
RAS to CAS (tRCD) : 4 clocks @ 266 MHz, 5 clocks @ 399 MHz
RAS Precharge (tRP) : 4 clocks @ 266 MHz, 5 clocks @ 399 MHz
Cycle Time (tRAS) : 10 clocks @ 266 MHz, 15 clocks @ 399 MHz
Min TRC : 16 clocks @ 266 MHz, 24 clocks @ 399 MHz
Information SPD EEPROM (A1)
Manufacturer : G Skill
Part Number : F2-6400CL5-2GBPQ
Serial Number : Unspecified
Type : DDR2-SDRAM PC2-6400 (399 MHz) - [DDR2-799]
Format : Regular UDIMM (133.35 x 3)
Size : 2048 MB (2 ranks, 8 banks)
Module Buffered : No
Module Registered : No
Module SLi Ready (EPP) : No
Width : 64-bit
Error Correction Capability (ECC) : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8, Self Refreshµs
Voltage : SSTL 1.8v
Prefetch Buffer : 4-bit
Manufacture : 2000
Supported Frequencies : 266 MHz, 399 MHz
CAS Latency (tCL) : 4 clocks @ 266 MHz, 5 clocks @ 399 MHz
RAS to CAS (tRCD) : 4 clocks @ 266 MHz, 5 clocks @ 399 MHz
RAS Precharge (tRP) : 4 clocks @ 266 MHz, 5 clocks @ 399 MHz
Cycle Time (tRAS) : 10 clocks @ 266 MHz, 15 clocks @ 399 MHz
Min TRC : 16 clocks @ 266 MHz, 24 clocks @ 399 MHz
Information SPD EEPROM (A2)
Manufacturer : OCZ
Part Number : OCZ2P10662G
Serial Number : Unspecified
Type : DDR2-SDRAM PC2-6400 (399 MHz) - [DDR2-799]
Format : Regular UDIMM (133.35 x 3)
Size : 2048 MB (2 ranks, 8 banks)
Module Buffered : No
Module Registered : No
Module SLi Ready (EPP) : Yes
Width : 64-bit
Error Correction Capability (ECC) : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8, Self Refreshµs
Voltage : SSTL 1.8v
Prefetch Buffer : 4-bit
Manufacture : 2000
Supported Frequencies : 266 MHz, 333 MHz, 399 MHz
CAS Latency (tCL) : 3 clocks @ 266 MHz, 4 clocks @ 333 MHz, 5 clocks @ 399 MHz
RAS to CAS (tRCD) : 4 clocks @ 266 MHz, 5 clocks @ 333 MHz, 5 clocks @ 399 MHz
RAS Precharge (tRP) : 4 clocks @ 266 MHz, 5 clocks @ 333 MHz, 5 clocks @ 399 MHz
Cycle Time (tRAS) : 10 clocks @ 266 MHz, 13 clocks @ 333 MHz, 15 clocks @ 399 MHz
Min TRC : 16 clocks @ 266 MHz, 20 clocks @ 333 MHz, 24 clocks @ 399 MHz
EPP Profile #1 : Full Performance
Voltage Level : 2.1V
Address Command Rate : 2T
Cycle Time : 1.875ns @ 533.33 MHz
CAS Latency (tCL) : 5 clocks
RAS to CAS (tRCD) : 5 clocks
RAS Precharge (tRP) : 5 clocks
Cycle Time (tRAS) : 15 clocks
tRC : 26 clocks
tWR : 6 clocks
Information SPD EEPROM (A3)
Manufacturer : OCZ
Part Number : OCZ2P10662G
Serial Number : Unspecified
Type : DDR2-SDRAM PC2-6400 (399 MHz) - [DDR2-799]
Format : Regular UDIMM (133.35 x 3)
Size : 2048 MB (2 ranks, 8 banks)
Module Buffered : No
Module Registered : No
Module SLi Ready (EPP) : Yes
Width : 64-bit
Error Correction Capability (ECC) : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8, Self Refreshµs
Voltage : SSTL 1.8v
Prefetch Buffer : 4-bit
Manufacture : 2000
Supported Frequencies : 266 MHz, 333 MHz, 399 MHz
CAS Latency (tCL) : 3 clocks @ 266 MHz, 4 clocks @ 333 MHz, 5 clocks @ 399 MHz
RAS to CAS (tRCD) : 4 clocks @ 266 MHz, 5 clocks @ 333 MHz, 5 clocks @ 399 MHz
RAS Precharge (tRP) : 4 clocks @ 266 MHz, 5 clocks @ 333 MHz, 5 clocks @ 399 MHz
Cycle Time (tRAS) : 10 clocks @ 266 MHz, 13 clocks @ 333 MHz, 15 clocks @ 399 MHz
Min TRC : 16 clocks @ 266 MHz, 20 clocks @ 333 MHz, 24 clocks @ 399 MHz
EPP Profile #1 : Full Performance
Voltage Level : 2.1V
Address Command Rate : 2T
Cycle Time : 1.875ns @ 533.33 MHz
CAS Latency (tCL) : 5 clocks
RAS to CAS (tRCD) : 5 clocks
RAS Precharge (tRP) : 5 clocks
Cycle Time (tRAS) : 15 clocks
tRC : 26 clocks
tWR : 6 clocks
Memory Controller Information
Memory Controller : Standard, EDO
Number of connectors : 4
Max. Module Size : 32 MB
Max. Memory Size : 128 MB
Supported Speed : 70ns, 60ns
Supported Voltages : 5v
Error Detection Method : No
Error Correction Capability : None
Current/Supported Interleave : 1-way/1-way
post edited by coolyou - 2014/10/04 21:29:03
OLD: Intel Q6600 G0 , EVGA nForce 750i , Hyper 212 Plus , OCZ Platinum 4GB , GeForce 8800 GT 512MB , COOLER MASTER RC-690-KKN1-GP , Auzentech Auzen X-Fi Prelude , Corsair TX850NEW: Intel i7-5820K @ 4.6Ghz (1.284v , 25*C) , ASRock X99X , NZXT X61 , G.SKILL Ripjaws 4 Series 64GB , EVGA GTX 970 SC - Blower , Corsair Carbide Series Air 540 , ASUS Xonar Essence STX , Corsair TX850 (<- PS is 10 years old and still kicking ass!!)
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bob16314
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If you have mismatched RAM installed like you do, the BIOS will detect that and run all the RAM at the speed of the slowest RAM if the memory settings in BIOS are in Auto mode, this is by design because RAM will normally run slower but not always faster..Also, and most importantly, mismatched RAM should have no more than a +/- 0.1V difference in the VDIMM.
There is an SPD chip in each stick of RAM that contains information about the RAM such as the speed, timing and voltage..Different RAM can have different SPD information..The SPD speed frequently is not the full rated speed of the RAM, the SPD contains the JEDEC specs for better compatibilty across different platforms..The motherboard BIOS reads the information in the SPD chip and automatically sets the speed, timing and voltage in Auto mode unless you override it and change the settings manually.
Your RAM is DDR which means Double Data Rate..In CPU-Z, 800MHz RAM will be read at it's base clock speed of 400MHz..1066MHz RAM will be read at it's base clock speed of 533MHz..You need to double the base clock speed shown to get the actual speed.
The full rated speed of your OCZ RAM is 1066MHz, 5-5-5-18-2T, 2.1V..The full rated speed of your G.Skill RAM is 800MHz, 5-5-5-15, 1.8V to 1.9V..This can, and most likely will be a problem even if you set up the RAM manually in the BIOS, but you can try it by going into BIOS -> Frequency/Voltage Control -> FSB & Memory Config and set the FSB Memory Ratio to Unlinked..Then set the FSB (QDR)MHz to 1066MHz..Then go to the Memory Timing Setting and set Memory Timing Setting to Expert..Then set the tCL, tRCD, tRP, tRAS and Command Per Clock to 5-5-5-18-2T respectively..Then go to System Voltages and set Memory to 2.0V..This will take the settings out of Auto mode and overclock (and slightly overvolt) your G.Skill RAM to match your OCZ RAM..Save & Exit..Hope for the best..If you have any problems, you'll need to reset CMOS to put things back in Auto mode again as well as possibly removing mismatched modules..An overclock/overvolt of the RAM is at your own risk.
If you can't get the RAM to work together at higher speed, you'll need to be happy with the lower frequency, timing and voltage of the 800MHz G.Skill stuff, and even then you might have issues with BSODs, freezing, etc..Getting that mismatched RAM to play well reliably together may not even be possible at all..No guarantees..Althought it is possible, and I have gotten mismatched RAM to work, ideally you want matching modules.
Having more RAM in your case is more beneficial than having RAM that runs at 1066MHz instead of 800MHz..You probably won't notice any difference at all between 800MHz and 1066MHz.
* Corsair Obsidian 450D Mid-Tower - Airflow Edition * ASUS ROG Maximus X Hero (Wi-Fi AC) * Intel i7-8700K @ 5.0 GHz * 16GB G.SKILL Trident Z 4133MHz * Sabrent Rocket 1TB M.2 SSD * WD Black 500 GB HDD * Seasonic M12 II 750W * Corsair H115i Elite Capellix 280mm * EVGA GTX 760 SC * Win7 Home/Win10 Home * "Whatever it takes, as long as it works" - Me
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coolyou
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Thanks for the reply. The modules are set manually with the settings that were posted above 800Mhz 1:2 5-5-5-15-24-2T | 3-24-5-9-7.8, but forgot to mention voltage is set at 2.0v. The memory is unlinked and I'm expecting 800Mhz rated speed, obviously not 1066Mhz since they're not rated at that. The above settings are Gskill recommended settings so they ought to do fine with OCZ. So it seems that I, obviously, was reading CPU-Z incorrectly as to what the actual clock speed is displaying as 400Mhz. I swear that when I only had OCZ installed and benchmarked it a few years ago, it listed it as 800Mhz or 1066Mhz, whichever I set the bios to. Oh well. Anyway, since you mentioned it. The mismatched pairs comment is false. Mismatching memory, of relatively the same speeds, has been working before the marketing stunt for "Paired/Matched" memory was introduced in late 2005. Paired/Matched memory is a convenience, but not much beyond that. Ideally it is nice to buy matched pairs to avoid having to deal with drawn out troubleshooting issues and dealing with multiple manufacturers, but a consumer also has the same luck with mismatched vs matched pairs. It was the norm prior to "matched" modules to buy relatively the same speed memory from manufacturers, if one manufacturer hadn't had the item you get it someplace else and it'd work, but it was a hassle. The norm today is matched memory, so consumers don't have to buy single modules and stay with one manufacturer. It is hassle free compared to then, but mismatching memory isn't as what most manufactures NOW claim it is.
post edited by coolyou - 2014/10/05 10:09:29
OLD: Intel Q6600 G0 , EVGA nForce 750i , Hyper 212 Plus , OCZ Platinum 4GB , GeForce 8800 GT 512MB , COOLER MASTER RC-690-KKN1-GP , Auzentech Auzen X-Fi Prelude , Corsair TX850NEW: Intel i7-5820K @ 4.6Ghz (1.284v , 25*C) , ASRock X99X , NZXT X61 , G.SKILL Ripjaws 4 Series 64GB , EVGA GTX 970 SC - Blower , Corsair Carbide Series Air 540 , ASUS Xonar Essence STX , Corsair TX850 (<- PS is 10 years old and still kicking ass!!)
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