The computer is a Compaq Presario CQ40. It currently has 1 GB of RAM DDR2 (Samsung-manufactured). There are two slots in the RAM part.
It says 766 MB usable ( which I think is because part of it goes to being the graphics card). The processor is an AMD Sempron(tm) SI-42 2.10 GHz.
I wanted to upgrade the RAM to 2 GB with a new installation of one 1 GB RAM, but I was also wondering if I can replace the old 1 GB DDR2 with a new 2 GB DDR3 RAM, and add
one more 1 GB DDR3 RAM, making the whole RAM capacity to 4 GB DDR3.
Please give me some thoughts. I think there have to be compatibility between the
motherboard and the new planned DDR3 RAMs as well, which I am not sure how to check.
Thanks!
It says 766 MB usable ( which I think is because part of it goes to being the graphics card). The processor is an AMD Sempron(tm) SI-42 2.10 GHz.
I wanted to upgrade the RAM to 2 GB with a new installation of one 1 GB RAM, but I was also wondering if I can replace the old 1 GB DDR2 with a new 2 GB DDR3 RAM, and add
one more 1 GB DDR3 RAM, making the whole RAM capacity to 4 GB DDR3.
Please give me some thoughts. I think there have to be compatibility between the
motherboard and the new planned DDR3 RAMs as well, which I am not sure how to check.
Thanks!
After switching slots, RAM is no longer DUAL Channel - 970 Extreme3 R2.0 After getting some awful memory benchmarks, I referred to the manual which states: If you adopt DDR3 2100/1866/1800/1600 memory modules on thismotherboard, it is recommended to install them on DDR3A2 andDDR3B2 slots. It is based on the DDR2-800 standard. PC2-5300 can only transfer 5,333 MBps; that is known as the DDR2-667 standard. PC3-6400 does transfer 6,400 MBps, but it is a DDR3 standard known as DDR3-800. DDR3 modules cannot be installed into DDR2 memory slots. DDR2-667 once again is a DDR2 standard that specifies 5,333 MBps data transfer.
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- Another thing to note is that the pin placement is different between each iteration of DDR memory. Unless the motherboard supports both DDR2 and DDR3, upgrading to DDR3 will not work. Here is where you can get more information: http://www.hardwaresecrets.com/article/Everything-You-Need-To-Know-About-DDR-DDR2-and-DDR3-Memories/167/7. If the computer was a desktop, I would say unless you wish to upgrade the motherboard, stick with DDR2. The cost and effort it takes to just upgrade the motherboard so you can use DDR3 along with your existing processor and hard drive is not worth it, mostly since the performance gain may not be that big of a difference to really notice. Since this is a laptop, you would not be able to upgrade the motherboard, so you would be stuck with DDR2.
- yep , Oron is right , DDR2 and DDR3 are different technologies and the motherboard may not be compatible with DDR3 RAM , So just consult it with your motherboard manufacturer.
- You cannot change DDR2 modules for DDR3, they are different technologies and the modules are not compatible with each other.According to Crucial you can upgrade your laptop either to 4GB or to 8GB, depending on the exact model. I suggest you head over to Crucial's site (crucial.com in the US, crucial.com/uk in hte UK, and I'm sure there are other local versions) and run the 'system scanner' which will identify your model accurately, and will take you to a page showing you all the upgrade options available (available from them, that is, but they have a fairly comprehensive stock of memory modules).
- According to the manual
http://h10032.www1.hp.com/ctg/Manual/c01714937.pdf
1) 2 SODIMM slots
2) Supports up to 4 GB of system RAM
3) PC2-6400 800-MHz, DDR2
4) Supports the following configurations:
? 4096 MB total system memory (2048 × 2)
? 3072 MB total system memory (2048 + 1024)
? 2048 MB total system memory (2048 × 1)
? 2048 MB total system memory (1024 × 2)
? 1024 MB total system memory (1024 × 1)if you change to DDR3 you will have problems
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DDR3 memory population guidelinesNOTE: Memory configurations listed do not apply to Factory Integrated Models. Click here to use Online DDR3 Memory Configuration Tool for detailed memory configuration rules and guidelines. Some DIMM installation guidelines are summarized below:
NOTE:
Basic memory slot and population diagramNOTE: Population order; start with 'A' first, 'B' second, 'C' third, etc.
Standard memory configuration (1 CPU model)NOTE: 6GB, consisting of three (3) 2GB dual-rank PC3-10600 RDIMMs
Standard memory plus optional memory (1 CPU model)NOTE:
Standard memory replaced with optional memory (1 CPU model)RDIMM maximum configuration (1 CPU model) NOTE: 96GB, consisting of six (6) 16GB quad-rank PC3-8500 RDIMMs
UDIMM maximum configuration (1 CPU model)NOTE: 12GB, consisting of six (6) 2GB dual-rank PC3-10600 UDIMMs
Standard memory replaced with optional memory (2 CPU model)RDIMM maximum configuration (2 CPU model) NOTE: 192GB, consisting of twelve (12) 16GB quad-rank PC3-8500 RDIMMs
UDIMM maximum configurationNOTE: 48GB, consisting of twelve (12) 4GB dual-rank PC3-10600 UDIMMs
NOTE: Capacity references are rounded to the common Gigabyte values.
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