mohittomar13

OS=Xubuntu 20.4.1 LTS / Windows 10 (Pre-installed)
Machine=Acer Aspire A515 52-31AW

I'm trying to use 2 different frequency RAMs, one is 2400Mhz 8GB (Kingston) and the other 2666Mhz 4GB(Hynix). Previously I was using 8GB kingston with 4GB RAM on my dell3568 but the frequencies were similar. i.e. 2400Mhz. I spilled water on my Dell machine so sold it and got a new Acer Aspire 5 which came with 4GB Hynix. Now I'm planning to use the 8GB memory from dell on this new machine.

Following is the complete list of details produced by decode-dimms and i2c-tools

4GB Hynix

Bash:

---=== Memory Characteristics ===---
Maximum module speed                             2666 MHz (PC4-21300)
Size                                             4096 MB
Banks x Rows x Columns x Bits                    8 x 16 x 10 x 64
SDRAM Device Width                               16 bits
Ranks                                            1
AA-RCD-RP-RAS (cycles)                           19-19-19-43
Supported CAS Latencies                          20T, 19T, 18T, 17T, 16T, 15T, 14T, 13T, 12T, 11T, 10T

---=== Timings at Standard Speeds ===---
AA-RCD-RP-RAS (cycles) as DDR4-2666              19-19-19-43
AA-RCD-RP-RAS (cycles) as DDR4-2400              17-17-17-39
AA-RCD-RP-RAS (cycles) as DDR4-2133              15-15-15-35
AA-RCD-RP-RAS (cycles) as DDR4-1866              13-13-13-30
AA-RCD-RP-RAS (cycles) as DDR4-1600              11-11-11-26

---=== Timing Parameters ===---
Minimum Cycle Time (tCKmin)                      0.750 ns
Maximum Cycle Time (tCKmax)                      1.600 ns
Minimum CAS Latency Time (tAA)                   13.750 ns
Minimum RAS to CAS Delay (tRCD)                  13.750 ns
Minimum Row Precharge Delay (tRP)                13.750 ns
Minimum Active to Precharge Delay (tRAS)         32.000 ns
Minimum Active to Auto-Refresh Delay (tRC)       45.750 ns
Minimum Recovery Delay (tRFC1)                   350.000 ns
Minimum Recovery Delay (tRFC2)                   260.000 ns
Minimum Recovery Delay (tRFC4)                   160.000 ns
Minimum Four Activate Window Delay (tFAW)        30.000 ns
Minimum Row Active to Row Active Delay (tRRD_S)  5.300 ns
Minimum Row Active to Row Active Delay (tRRD_L)  6.400 ns
Minimum CAS to CAS Delay (tCCD_L)                5.000 ns
Minimum Write Recovery Time (tWR)                15.000 ns
Minimum Write to Read Time (tWTR_S)              2.500 ns
Minimum Write to Read Time (tWTR_L)              7.500 ns

---=== Other Information ===---
Package Type                                     Monolithic
Maximum Activate Count                           Unlimited
Post Package Repair                              One row per bank group
Soft PPR                                         Supported
Module Nominal Voltage                           1.2 V
Thermal Sensor                                   No

---=== Physical Characteristics ===---
Module Height                                    30 mm
Module Thickness                                 2 mm front, 1 mm back
Module Reference Card                            C revision 0

---=== Manufacturer Data ===---
Module Manufacturer                              Undefined
Part Number                                      Undefined

8GB Kingston

Code:

---=== Memory Characteristics ===---
Maximum module speed                             2400 MHz (PC4-19200)
Size                                             8192 MB
Banks x Rows x Columns x Bits                    16 x 16 x 10 x 64
SDRAM Device Width                               8 bits
Ranks                                            1
AA-RCD-RP-RAS (cycles)                           17-17-17-39
Supported CAS Latencies                          18T, 17T, 16T, 15T, 14T, 13T, 12T, 11T, 10T

---=== Timings at Standard Speeds ===---

AA-RCD-RP-RAS (cycles) as DDR4-2400              17-17-17-39
AA-RCD-RP-RAS (cycles) as DDR4-2133              15-15-15-35
AA-RCD-RP-RAS (cycles) as DDR4-1866              13-13-13-30
AA-RCD-RP-RAS (cycles) as DDR4-1600              11-11-11-26

---=== Timing Parameters ===---
Minimum Cycle Time (tCKmin)                      0.833 ns
Maximum Cycle Time (tCKmax)                      1.600 ns
Minimum CAS Latency Time (tAA)                   13.750 ns
Minimum RAS to CAS Delay (tRCD)                  13.750 ns
Minimum Row Precharge Delay (tRP)                13.750 ns
Minimum Active to Precharge Delay (tRAS)         32.000 ns
Minimum Active to Auto-Refresh Delay (tRC)       45.750 ns
Minimum Recovery Delay (tRFC1)                   350.000 ns
Minimum Recovery Delay (tRFC2)                   260.000 ns
Minimum Recovery Delay (tRFC4)                   160.000 ns
Minimum Four Activate Window Delay (tFAW)        21.000 ns
Minimum Row Active to Row Active Delay (tRRD_S)  3.300 ns
Minimum Row Active to Row Active Delay (tRRD_L)  4.900 ns
Minimum CAS to CAS Delay (tCCD_L)                5.000 ns
Minimum Write Recovery Time (tWR)                15.000 ns
Minimum Write to Read Time (tWTR_S)              2.500 ns
Minimum Write to Read Time (tWTR_L)              7.500 ns

---=== Other Information ===---
Package Type                                     Monolithic
Maximum Activate Count                           Unlimited
Post Package Repair                              One row per bank group
Soft PPR                                         Supported
Module Nominal Voltage                           1.2 V
Thermal Sensor                                   No

---=== Physical Characteristics ===---
Module Height                                    30 mm
Module Thickness                                 2 mm front, 2 mm back
Module Reference Card                            A revision 2

---=== Manufacturer Data ===---
Module Manufacturer                              Undefined
Part Number                                      Undefined

I would like to know if it would be fine to use these RAMs together and would not cause any trouble. As far as my knowledge of hardware is concerned I think that we are good if the voltages are the same on both memory sticks that we are planning to use. The voltages of these sticks are 1.2 V.

But I just want to be sure before I open the case and put something inside.

Thanks in advance.

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Should I mix 2400Mhz RAM with 2666Mhz

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6K views 4 replies 3 participants last post by mohittomar13 Jun 9, 2021

mohittomar13 Discussion starter

680 posts · Joined 2011

#1 · Jun 4, 2021

Bash:

---=== Memory Characteristics ===---
Maximum module speed                             2666 MHz (PC4-21300)
Size                                             4096 MB
Banks x Rows x Columns x Bits                    8 x 16 x 10 x 64
SDRAM Device Width                               16 bits
Ranks                                            1
AA-RCD-RP-RAS (cycles)                           19-19-19-43
Supported CAS Latencies                          20T, 19T, 18T, 17T, 16T, 15T, 14T, 13T, 12T, 11T, 10T

---=== Timings at Standard Speeds ===---
AA-RCD-RP-RAS (cycles) as DDR4-2666              19-19-19-43
AA-RCD-RP-RAS (cycles) as DDR4-2400              17-17-17-39
AA-RCD-RP-RAS (cycles) as DDR4-2133              15-15-15-35
AA-RCD-RP-RAS (cycles) as DDR4-1866              13-13-13-30
AA-RCD-RP-RAS (cycles) as DDR4-1600              11-11-11-26

---=== Timing Parameters ===---
Minimum Cycle Time (tCKmin)                      0.750 ns
Maximum Cycle Time (tCKmax)                      1.600 ns
Minimum CAS Latency Time (tAA)                   13.750 ns
Minimum RAS to CAS Delay (tRCD)                  13.750 ns
Minimum Row Precharge Delay (tRP)                13.750 ns
Minimum Active to Precharge Delay (tRAS)         32.000 ns
Minimum Active to Auto-Refresh Delay (tRC)       45.750 ns
Minimum Recovery Delay (tRFC1)                   350.000 ns
Minimum Recovery Delay (tRFC2)                   260.000 ns
Minimum Recovery Delay (tRFC4)                   160.000 ns
Minimum Four Activate Window Delay (tFAW)        30.000 ns
Minimum Row Active to Row Active Delay (tRRD_S)  5.300 ns
Minimum Row Active to Row Active Delay (tRRD_L)  6.400 ns
Minimum CAS to CAS Delay (tCCD_L)                5.000 ns
Minimum Write Recovery Time (tWR)                15.000 ns
Minimum Write to Read Time (tWTR_S)              2.500 ns
Minimum Write to Read Time (tWTR_L)              7.500 ns

---=== Other Information ===---
Package Type                                     Monolithic
Maximum Activate Count                           Unlimited
Post Package Repair                              One row per bank group
Soft PPR                                         Supported
Module Nominal Voltage                           1.2 V
Thermal Sensor                                   No

---=== Physical Characteristics ===---
Module Height                                    30 mm
Module Thickness                                 2 mm front, 1 mm back
Module Reference Card                            C revision 0

---=== Manufacturer Data ===---
Module Manufacturer                              Undefined
Part Number                                      Undefined

8GB Kingston

Code:

---=== Memory Characteristics ===---
Maximum module speed                             2400 MHz (PC4-19200)
Size                                             8192 MB
Banks x Rows x Columns x Bits                    16 x 16 x 10 x 64
SDRAM Device Width                               8 bits
Ranks                                            1
AA-RCD-RP-RAS (cycles)                           17-17-17-39
Supported CAS Latencies                          18T, 17T, 16T, 15T, 14T, 13T, 12T, 11T, 10T

---=== Timings at Standard Speeds ===---

AA-RCD-RP-RAS (cycles) as DDR4-2400              17-17-17-39
AA-RCD-RP-RAS (cycles) as DDR4-2133              15-15-15-35
AA-RCD-RP-RAS (cycles) as DDR4-1866              13-13-13-30
AA-RCD-RP-RAS (cycles) as DDR4-1600              11-11-11-26

---=== Timing Parameters ===---
Minimum Cycle Time (tCKmin)                      0.833 ns
Maximum Cycle Time (tCKmax)                      1.600 ns
Minimum CAS Latency Time (tAA)                   13.750 ns
Minimum RAS to CAS Delay (tRCD)                  13.750 ns
Minimum Row Precharge Delay (tRP)                13.750 ns
Minimum Active to Precharge Delay (tRAS)         32.000 ns
Minimum Active to Auto-Refresh Delay (tRC)       45.750 ns
Minimum Recovery Delay (tRFC1)                   350.000 ns
Minimum Recovery Delay (tRFC2)                   260.000 ns
Minimum Recovery Delay (tRFC4)                   160.000 ns
Minimum Four Activate Window Delay (tFAW)        21.000 ns
Minimum Row Active to Row Active Delay (tRRD_S)  3.300 ns
Minimum Row Active to Row Active Delay (tRRD_L)  4.900 ns
Minimum CAS to CAS Delay (tCCD_L)                5.000 ns
Minimum Write Recovery Time (tWR)                15.000 ns
Minimum Write to Read Time (tWTR_S)              2.500 ns
Minimum Write to Read Time (tWTR_L)              7.500 ns

---=== Other Information ===---
Package Type                                     Monolithic
Maximum Activate Count                           Unlimited
Post Package Repair                              One row per bank group
Soft PPR                                         Supported
Module Nominal Voltage                           1.2 V
Thermal Sensor                                   No

---=== Physical Characteristics ===---
Module Height                                    30 mm
Module Thickness                                 2 mm front, 2 mm back
Module Reference Card                            A revision 2

---=== Manufacturer Data ===---
Module Manufacturer                              Undefined
Part Number                                      Undefined

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mohittomar13

· Registered

Joined May 2, 2011

680 Posts

Discussion starter · #3 · Jun 4, 2021

Not sure if it's correct or not but I've experienced hardware degradation over time if RAM sticks are of different frequencies. Anyways I'll put the 8GB stick after some time. Thanks for your help.

mohittomar13

· Registered

Joined May 2, 2011

680 Posts

Discussion starter · #5 · Jun 9, 2021

Blu_86 said:
if you mix on an OEM machine like yours it's going to dial it down the to the slowest memory have installed. 2400 mhz.

Yes, its alright. I do not use it for gaming. I just do a lot of multitasking with multiple firefox tabs open and a lot of applications running.

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