Все обсуждения > Форумы Steam > Hardware and Operating Systems > Подробности темы
fruit bat 16 ноя. 2019 г. в 16:14
DRAM SSD's
where can I find a list with DRAM based SSD products?
and if there's no such thing, then how can I figure it out if a SSD I want to buy has DRAM or no..?!
Отредактировано fruit bat; 16 ноя. 2019 г. в 16:14
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Omega 16 ноя. 2019 г. в 16:27 
DRAM based SSDs don't exist. The reason being that DRAM is volatile, this means that the data is lost when the DRAM isn't powered.

SSDs use NAND flash memory which retains the data even when not powered.

Some SSDs do have a small DRAM cache. This is refered to as "cache" in the spec sheet.
Отредактировано Omega; 16 ноя. 2019 г. в 16:35
#1
Omega 16 ноя. 2019 г. в 16:32 
Автор сообщения: 「 Mister .M. 」
Автор сообщения: Omega
DRAM based SSDs don't exist

completly wrong!
Kingston A1000 is Dram based while ADATA SU650 (for example) is not.
No, you are wrong. The A1000 uses TLC NAND.
#2
Komrade 16 ноя. 2019 г. в 16:42 
Автор сообщения: 「 Mister .M. 」
Автор сообщения: Omega
No, you are wrong. The A1000 uses TLC NAND.

I meant to type A400 not A1000
it's even written "DRAM" on the back of the case that it comes in
https://www.kingston.com/en/ssd/a400-solid-state-drive#specifications

...no it doesn't, it uses nand flash.
#3
Omega 16 ноя. 2019 г. в 16:43 
Автор сообщения: 「 Mister .M. 」
Автор сообщения: Omega
No, you are wrong. The A1000 uses TLC NAND.

I meant to type A400 not A1000
it's even written "DRAM" on the back of the case that it comes in
Also NAND.

That "DRAM" is most likely refering to the SSDs cache, assuming it has one.
Отредактировано Omega; 16 ноя. 2019 г. в 16:45
#4
fruit bat 16 ноя. 2019 г. в 16:47 
Автор сообщения: notkennyS
Автор сообщения: 「 Mister .M. 」

I meant to type A400 not A1000
it's even written "DRAM" on the back of the case that it comes in
https://www.kingston.com/en/ssd/a400-solid-state-drive#specifications

...no it doesn't, it uses nand flash.

dont all the ssd's use nand ?
#5
Omega 16 ноя. 2019 г. в 16:48 
Автор сообщения: q|O_O|p
Автор сообщения: notkennyS
https://www.kingston.com/en/ssd/a400-solid-state-drive#specifications

...no it doesn't, it uses nand flash.

dont all the ssd's use nand ?
Yeah. (Now I am waiting for someone to tell me I am wrong and link me a glorified "RAM cache" SSD they use in data centers or something)
#6
fruit bat 16 ноя. 2019 г. в 17:28 
Автор сообщения: Omega
Автор сообщения: q|O_O|p

dont all the ssd's use nand ?
Yeah. (Now I am waiting for someone to tell me I am wrong and link me a glorified "RAM cache" SSD they use in data centers or something)

im still confused.. so dram ssd's dont exist or they exist?
and if they exist, are they better or no?
and if they are better how do I know which ssd has the dram thing and which doesnt
#7
nullable 16 ноя. 2019 г. в 17:30 
Many SSDs have DRAM for caching. Some low end/entry level SSDs are DRAMless. "DRAM based" I think is you misunderstanding some terminology.

If it's not DRAMless then it has a DRAM cache. Not sure why so many people are complicating things.
#8
fruit bat 16 ноя. 2019 г. в 17:31 
Автор сообщения: Brockenstein
Many SSDs have DRAM for caching. Some low end/entry level SSDs are DRAMless. "DRAM based" I think is you misunderstanding some terminology.

If it's not DRAMless then it has a DRAM cache. Not sure why so many people are complicating things.

ok and how do I know if a SSD I wanna buy is dramless or not?
#9
Komrade 16 ноя. 2019 г. в 17:36 
Автор сообщения: q|O_O|p
Автор сообщения: Brockenstein
Many SSDs have DRAM for caching. Some low end/entry level SSDs are DRAMless. "DRAM based" I think is you misunderstanding some terminology.

If it's not DRAMless then it has a DRAM cache. Not sure why so many people are complicating things.

ok and how do I know if a SSD I wanna buy is dramless or not?
If there's no cache it's DRAMless.
#10
Omega 16 ноя. 2019 г. в 17:48 
I am not sure if modern SSDs still use DRAM cache, our NAND now has become a lot faster. I recall reading that the fastest PCI-e 4.0 SSDs have NAND which is comparable in performace to DDR2.
#11
Bad 💀 Motha 16 ноя. 2019 г. в 18:13 
Ssds do not have any dram cache like a hdd does. Why? Because ssds do not need that and also an ssd has hidden built in extra nand for over-provisioning.

Look at WD, Crucial, Samsung...

DDR2 is approx 16gbps if iirc
Отредактировано Bad 💀 Motha; 16 ноя. 2019 г. в 18:14
#12
Omega 16 ноя. 2019 г. в 18:19 
Автор сообщения: Bad 💀 Motha
Ssds do not have any dram cache like a hdd does. Why? Because ssds do not need that and also an ssd has hidden built in extra nand for over-provisioning.
The older ones from a few generations ago did. Modern ones I am pretty sure indeed no longer have this.

I double checked and the Samsung Evo 860 series still uses half a gig of cache.
Отредактировано Omega; 16 ноя. 2019 г. в 18:21
#13
Bad 💀 Motha 16 ноя. 2019 г. в 18:21 
Why would any ssd need dram cache buffer, that doesn't even make sense and would bottleneck the entire ssd IO
#14
Omega 16 ноя. 2019 г. в 18:23 
From the 860 Evo spec sheet:

Автор сообщения: https://www.samsung.com/semiconductor/minisite/ssd/product/consumer/860evo/
CACHE MEMORY

512 MB Low Power DDR4 SDRAM
(250 GB, 500 GB)
#15
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