Maybe it is not it's intended market.. But a ~Raven Ridge at 7nm, with 12GB of this RAM would have very respectable 68GB/s bandwidth, and would be perfect for highend ultra-portable with gaming capability.
I have an unhealthy obsession with the prowess of non-discrete graphics, so any affordable memory technology that can speed up iGPUs is automatically exciting to me.
Every time I hear news about LPDDR4/X, it always sounds to me like it has more bandwidth at 128-bit than standard DDR4 has when running in dual-channel.
Wikipedia states that DDR4-3200 only has a single-channel bandwidth of 25.6 GB/s, which when doubled still falls behind this LPDDR4X chip when used in a 128-bit configuration. If this is true, how could LPDDR4/X, which operates at a lower voltage than DDR4, accomplish this?
It doesn't. LPDDR4X is operating at 4266Mhz rather than 3200mhz. Meaning it would offer 68.2GB/s of bandwidth on a 128-bit bus... Where-as at 3200mhz you are looking at 51.2GB/s on a 128bit bus.
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iwod - Thursday, November 8, 2018 - link
Sounds exactly like the chip being used in the current iPad Pro 1TB.neblogai - Thursday, November 8, 2018 - link
Maybe it is not it's intended market.. But a ~Raven Ridge at 7nm, with 12GB of this RAM would have very respectable 68GB/s bandwidth, and would be perfect for highend ultra-portable with gaming capability.wizfactor - Thursday, November 8, 2018 - link
I have an unhealthy obsession with the prowess of non-discrete graphics, so any affordable memory technology that can speed up iGPUs is automatically exciting to me.ImSpartacus - Friday, November 9, 2018 - link
Yeah, that'd be pretty nice for a hyper-integrated machine, like a Surface Pro-esque tablet or something.wizfactor - Thursday, November 8, 2018 - link
Every time I hear news about LPDDR4/X, it always sounds to me like it has more bandwidth at 128-bit than standard DDR4 has when running in dual-channel.Wikipedia states that DDR4-3200 only has a single-channel bandwidth of 25.6 GB/s, which when doubled still falls behind this LPDDR4X chip when used in a 128-bit configuration. If this is true, how could LPDDR4/X, which operates at a lower voltage than DDR4, accomplish this?
StevoLincolnite - Thursday, November 8, 2018 - link
It doesn't. LPDDR4X is operating at 4266Mhz rather than 3200mhz.Meaning it would offer 68.2GB/s of bandwidth on a 128-bit bus... Where-as at 3200mhz you are looking at 51.2GB/s on a 128bit bus.
wizfactor - Thursday, November 8, 2018 - link
Oh I see, so I've been making the incorrect comparison this whole time. That means DDR4-3200 and LPDDR4 should have the same bandwidth, right?If that's the case, is there any reason why any PC manufacturer would choose regular DDR4 over its low-power variant? Price? Latency?
Lolimaster - Friday, November 9, 2018 - link
Maybe it's similar to GDDR, faster bw but loose timmings and slow performance, not much important for a smartphone.FreidoNumeroUno - Sunday, November 11, 2018 - link
I have the same question. Can someone help with a clearer answer?anonym - Tuesday, November 13, 2018 - link
Use different core and I/O voltage.