What does 8+8 mean in smartphone storage mean? - Page 1
Forum section: electronics / general

author: abdolah
author_rank: Regular Contributor
timestamp: March 17, 2025, 10:46:13 pm
content: Hi everyone hope you have a great dayI have a trouble in understanding what does 8+8 or 16+8 or 16+12 meanFor example this H9TQ64A8GTMCUR-KUM is a storage chip in old phone, when I searched about it , I found out that it's eMCP 8GB eMMC5.1 + 8Gb LPDDR3-1866What I don't understand is the capacity for it and if it has a ram integrated in it and that other 8gb is ram but the that doesn't make sense because the phone is too old to have 8gb of ramThen I thought maybe it's a total of 16gb capacity but the I ran in to another chip kmgx6001bm-b514 after I searched about it shows as 32+24 so I'm confused on what does it mean, it it storage+ ram or what?Hope someone to explain and thanks for your time

author: ataradov
author_rank: Super Contributor
timestamp: March 18, 2025, 01:30:49 am
content: Yes, those are flash and RAM sizes. RAM has been really cheap for a long time, so it does not make sense to make variants of those combo chips with less RAM. So, if you need more flash, you get more RAM for free.

author: abdolah
author_rank: Regular Contributor
timestamp: March 18, 2025, 02:48:22 am
content: Ok if that's true then how you can explain the 32g+24g , when I searched for it the website said it's density 64GBThis is very confusing even if you added both 32+24 you get 56g it's not even close to what the website said 64gb?

author: abdolah
author_rank: Regular Contributor
timestamp: March 18, 2025, 02:52:02 am
content: This is a screenshot of the description of the chip kmgx6001bm-b514Wich is supposed to be 32g+24g ram

author: ataradov
author_rank: Super Contributor
timestamp: March 18, 2025, 03:15:34 am
content: This is some random Chinese site did not correctly fill in the information. That single "density" parameter does not make sense for a combined device, so the person filling out the form picked the closest value from the available.You don't need to look at random sites. You can just look on Samsung sitehttps://semiconductor.samsung.com/us/mcp/model/lpddr5-umcp/kmgx6001ba-b514/Also, RAM part is is gigabits, so this device is 3 GBytes.

author: tom66
author_rank: Super Contributor
timestamp: March 18, 2025, 09:40:27 am
content: In particular, it indicates that the phone can use up to 8GB of the eMMC as a swap file. I guess it is a kernel configuration. I do not think it is good for the flash memory, especially lower quality flash as common with eMMC which tends to wear quickly, and it won't have great performance, but it is an option if the phone begins to struggle for memory.

author: abdolah
author_rank: Regular Contributor
timestamp: March 19, 2025, 08:28:24 am
content: Yeah that's what i thought too that this site have wrong density value, but I'm still confused about this

author: abdolah
author_rank: Regular Contributor
timestamp: March 19, 2025, 08:36:35 am
content: Oh so it's bits not bytes , bummer , now it makes sense, thanks a lot for clearing that , but why they choose to right the values like this , i guess for propaganda marketing pull-shiteYeah they use to be in the same package but in modern phones ram is separate chip and it's soldered on top of the CPU and nand is it's own chip