Hi MDL communitiy, I have a new Lenovo G510 laptop. It came with a single DIMM of 4GB DDR3 ram ( DIMM's internal organisation is 1x8 rank x banks). laptop has 64 bit memory width architecture. I wanto to add a second 4GB DIMM of same frequency of 1600MHz. So here is my inquary. Should I use the same organisation of DIMM ( 1x8) for the second DIMM slot in order to prevent any performance loss or can I use 2x4 organised DIMM w/o any performance loss , assuming that all other timins latencies are same? Second question is that , is it true that while the memory bus structure is 64 bit , system will always work in single channel mode regardless of how you configure multiple DIMMs in in available DIMM sockets? Rgds
Thanks for your info. I will keep my first DIMM and try to find a second one with same properties. Below is some AIDATA64 info regarding present DIMM and northbride. As I understand that chipset is suitable for dual channel but for my idea if the phisical layout is 64 bit, it is not possible to run it in dual channel. Here, my DIMMS' latencies are shown as 11-11-11-28 On the other hand I see a sligthly differen notation on the market regarding DIMM timings like 11-11-B1 or 11-11-B2 or 11-11-F3 etc . So would you kindly explain what is this notation differences and how should I decide which is better? AIDATA info : Memory Timings: @ 800 MHz 11-11-11-28 (CL-RCD-RP-RAS) / 39-208-5-12-6-6-24 (RC-RFC-RRD-WR-WTR-RTP-FAW) @ 761 MHz 10-10-10-27 (CL-RCD-RP-RAS) / 37-199-5-12-6-6-23 (RC-RFC-RRD-WR-WTR-RTP-FAW) @ 685 MHz 9-9-9-24 (CL-RCD-RP-RAS) / 33-179-5-11-6-6-21 (RC-RFC-RRD-WR-WTR-RTP-FAW) @ 609 MHz 8-8-8-22 (CL-RCD-RP-RAS) / 30-159-4-10-5-5-19 (RC-RFC-RRD-WR-WTR-RTP-FAW) @ 533 MHz 7-7-7-19 (CL-RCD-RP-RAS) / 26-139-4-8-4-4-16 (RC-RFC-RRD-WR-WTR-RTP-FAW) @ 457 MHz 6-6-6-16 (CL-RCD-RP-RAS) / 22-119-3-7-4-4-14 (RC-RFC-RRD-WR-WTR-RTP-FAW) @ 380 MHz 5-5-5-14 (CL-RCD-RP-RAS) / 19-100-3-6-3-3-12 (RC-RFC-RRD-WR-WTR-RTP-FAW) [ North Bridge: Intel Haswell-MB IMC ] North Bridge Properties: North Bridge Intel Haswell-MB IMC Intel Platform Shark Bay-MB Supported Memory Types DDR3-1066, DDR3-1333, DDR3-1600 SDRAM Maximum Memory Amount 16 GB Revision 06 Process Technology 22 nm VT-d Not Supported Extended APIC (x2APIC) Not Supported Memory Controller: Type Dual Channel (128-bit) Active Mode Single Channel (64-bit) Memory Timings: CAS Latency (CL) 11T RAS To CAS Delay (tRCD) 11T RAS Precharge (tRP) 11T RAS Active Time (tRAS) 28T Row Refresh Cycle Time (tRFC) 208T Command Rate (CR) 1T RAS To RAS Delay (tRRD) 5T Write Recovery Time (tWR) 12T Read To Read Delay (tRTR) Same Rank: 4T, Different Rank: 6T, Different DIMM: 6T Read To Write Delay (tRTW) Same Rank: 11T, Different Rank: 11T, Different DIMM: 11T Write To Read Delay (tWTR) 6T, Same Rank: 20T, Different Rank: 4T, Different DIMM: 4T Write To Write Delay (tWTW) Same Rank: 4T, Different Rank: 7T, Different DIMM: 7T Read To Precharge Delay (tRTP) 6T Write To Precharge Delay (tWTP) 24T Four Activate Window Delay (tFAW) 24T Write CAS Latency (tWCL) 8T CKE Min. Pulse Width (tCKE) 4T Refresh Period (tREF) 6240T Round Trip Latency (tRTL) DIMM4: 0T I/O Latency (tIOL) DIMM4: 0T Burst Length (BL) 8 ...... Thanks
I wouldn't worry too much about timing. Just match the speed & voltage. ie, if your current stick is 4GB DDR3-1600 PC3L, get the same. * PC3L is low voltage.
I have installed the second 4GB DIMM ( different brand but with the same specifications). No problem so far and as EFA11 stated above, mobo has started work in dual channel mode. I run cache and benchmark test and saw that speed was almost doubled.