Re:Video RAM Transplant Doubles RTX3070 Memory to 16GB
by segfaultbuserr on Wednesday March 24, 2021 @03:10PM
(#26571651)
> It would be better to have a switch mode PS generate the voltages required for erasing (effectively required for every write).
Interestingly, chips like simple USB and Ethernet controllers sometimes do feature an on-die switched-mode DC-DC circuitry to simplify the system design. You just connect an inductor and a capacitor to the DC-DC pin, and route its output to the Vcore input, pretty convenient.
Re:Video RAM Transplant Doubles RTX3070 Memory to 16GB
by kardos on Wednesday March 24, 2021 @03:16PM
(#26571733)
Do you mean this [1] kind of charge pump? The article indicates 90-95% efficient, that's a huge gap from 25%
Re:Video RAM Transplant Doubles RTX3070 Memory to 16GB
by segfaultbuserr on Wednesday March 24, 2021 @04:01PM
(#26572202)
Yes, but the keyword here is "sometimes", charge pumps can be efficient only when very specific conditions are met, usually low current and power (but there are exceptions), efficiency drops sharply as current increases. Putting the circuit onto the silicon creates many additional limitations.
But charge pumps are inefficient (like 25% efficient), take up a lot of die Space.
It would be better to have a switch mode PS generate the voltages required for erasing (effectively required for every write). On a USB key, whatever, but on a 24/7 system or laptop, it can matter.
Maybe it’s a thing now, but it’s very recent:
https://e2e.ti.com/blogs_/b/powerhouse/posts/how-to-speed-ss...