4090真的会被禁售吗？

可能许多朋友看到了禁售4090的消息。甚至英伟达自己都声称4090会受到影响。

许多平台上的4090也都应声断货涨价。

那么4090被禁售到底是真是假呢？

下面请看最新的3a090b条款

The new ECCN 3A090.b will control ICs with one or more digital processing

units having either:

(1) a ‘total processing performance’ of 2400 or more and less than 4800 and a

‘performance density’ of 1.6 or more and less than 5.92,

or (2) a ‘total processing performance’ of

1600 or more and a ‘performance density’ of 3.2 or more and less than 5.92.

Technical Notes:

1. ‘Total processing performance’ (‘TPP’) is 2 x ‘MacTOPS’ x ‘bit length of the operation’,

aggregated over all processing units on the integrated circuit.

a. For purposes of 3A090, ‘MacTOPS’ is the theoretical peak number of Tera

(1012) operations per second for multiply-accumulate computation (D=AxB+C).

b. The 2 in the ‘TPP’ formula is based on industry convention of counting one

multiply-accumulate computation, D=AxB+C, as 2 operations for purpose of

datasheets. Therefore, 2 x MacTOPS may correspond to the reported TOPS or

FLOPS on a datasheet.

c. For purposes of 3A090, ‘bit length of the operation’ for a multiply-accumulate

computation is the largest bit-length of the inputs to the multiply operation.

d. Aggregate the TPPs for each processing unit on the integrated circuit to arrive

at a total. ‘TPP’ = TPP1 + TPP2 + .... + TPPn (where n is the number or

processing units on the integrated circuit).

简单翻译一下，满足以下两个条件之一会受到出口管制。

1.浮点算力（以tflops为单位）和浮点数长度（以bit为单位）的乘积，处于2400和4800之间，且该乘积除以芯片面积（以平方毫米为单位），处于1.6和5.92之间。

2.算力和位宽的乘积高于1600，乘积除以芯片面积位于3.2和5.92之间。

通过查询可知，4090的单精度浮点和半精度浮点算力均为82.58tflops,，单精度浮点数长度为32bit，面积为609平方毫米。

单精度浮点算力与单精度浮点数乘积为2642.56,除以面积为4.339

满足以上条件中的第二条。

这样来看4090是不是要被禁售了呢。

但是文件中还有一条：

For 3A090.b, if the item is designed or

marketed for use in datacenters

这意味着4090虽然算力符合受限制的标准，但因为是消费用途产品，所以不会受到该出口限制影响。