Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Brand | Model | Type | Modem | Storage | CPU speed | CPU chip |
| --- | --- | --- | --- | --- | --- | --- |
| Sony | INT-W100 | Classic | V.34 | 2 MB | 112MHz | R4640 |
| Philips | MAT-960 | Classic | V.34 | 2 MB | 112MHz | R4640 |
| Sony | INT-W150 | New Classic | V.90 | 2 MB | 150MHz | RM5230 |
| Philips | MAT-965 | New Classic | V.90 | 2 MB | 150MHz | RM5230 |
| RCA | RW-2100 | New Classic | V.90 | 2 MB | 150MHz | RM5230 |
| RCA | RM-2100 | New Classic | V.90 | 2 MB | 150MHz | RM5230 |
| Sony | INT-W200 | Plus | V.90 | 1.1 GB | 150MHz | R4640 |
| Philips | MAT-972 | Plus | V.90 | 1.1 GB | 150MHz | R4640 |
| Samsung | SIS-100 | Plus | V.90 | 1.1 GB | 150MHz | R4640 |
| Mitsubishi | RW-2000 | Plus | V.90 | 1.1 GB | 150MHz | R4640 |
| Mitsubishi | RW-2001 | Plus | V.90 | 1.1 GB | 150MHz | R4640 |
| RCA | RW-2110 | Plus | V.90 | 2 MB | 167MHz | RM5230 |
| Sony | INT-W250 | New Plus | V.90 | 2 MB | 167MHz | RM5230 |
| Philips | MAT-976 | New Plus | V.90 | 2 MB | 167MHz | RM5230 |
| Echostar | Dishplayer 7100 | DISH tuner | V.90 | 8.6 GB | 167MHz | RM5230 |
| Echostar | Dishplayer 7200 | DISH tuner | V.90 | 17.6 GB | 167MHz | RM5230 |
| RCA | UltimateTV | DirecTV tuner | V.90 | 40 GB | 167MHz | RM5230 |
| RCA | RM-4100 | MSNTV2 | V.90 | 64 MB | 733MHz | Celeron |
| RCA | RM-4100 (2) | MSNTV2 | V.90 | 64 MB | 733MHz | Celeron |
Question:
Which CPU chip(s) is used in the Classic type hardware?
Answer:
R4640, R4640