Subj : Re: Pi5 M.2 HAT To : Pancho From : Theo Date : Wed Oct 30 2024 23:14:37 Pancho wrote: > On 10/30/24 08:50, Andy Burns wrote: > > Pancho wrote: > > > >> The official NVMe Pi Hat has been out for months, > > > > Oh, I don't have a Pi5, and though I kept hearing about 3rd party NVMe > > HATs and lack of official one > > > > OK, I see there is a story about rPi launching actual NVMe M.2 SSDs. As > opposed to a hat. I've no idea why they would do that. The obvious > suspicion is cashing in on a brand name. > > It may be they are doing it because supply of small-capacity 2230 NVMe is a bit of a minefield. eg I checked scan.co.uk and the smallest 2230 they have is 512GB. There are some 256GB sold by Amazon.co.uk which are more expensive (and a few more dispatched by other sellers, of variable trustworthiness). At least with the RPi brand you know they're compatible, and they seem to be decent value. > It's hard to know what is going on with the Raspberry Pi guys, the > RK3588 devices are clearly faster, lower energy, albeit with shit > software support. Who knows what will happen with the next generation > Arm SoCs. I guess maybe Raspberry Pi have a clue, and hence decided to > monetise the brand now, before a new product wipes the floor with them. It'll depend on what fab slots they can get. Not everyone can fab on the latest process, especially with a budget. Also how much cache they can afford to put on the die. RK3588: (64+64+512)*4+(32+32+128)*4+3072 = 6400KiB RPi5 : 512*4+2048 = 4096KiB RK3588 also has 4 extra A55 cores which RPi doesn't have, but is more expensive ($100+ for the Banana Pi). > >> I guess I should get one, or maybe an alternative. I just bought a > >> NVMe USB enclosure which has appalling performance > > > > Anyway, is it likely the write speeds are faster than the  read speeds? > > I know some enterprise SSDs come in "read mostly" or "write mostly" > > flavours, but for a Pi? > Dunno, IOPS doesn't mean a lot to me. As TNP says, maybe a write > operation is to cache, and a read is from main memory. > > On many solid state persistence devices you see a very fast initial > write (presumably to cache) before quickly settling down to a much lower > rate for big files. Any decent benchmarking tool should get past the cache to exercise the real storage. I think they've got them around the wrong way. Their ODM Biwin's 2230 has more read than write IOPS: https://droix.co.uk/product/biwin-2230/ Theo --- SoupGate-Win32 v1.05 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3) .