# Specifications/Requirements

## Grayskull™ Tensix Processor

The Grayskull™ e75 and e150 Tensix Processor add-in boards are built using the Tenstorrent Grayskull™ Tensix Processor:

- **Tensix Core Count:** 120
- **SRAM:** 120MB (1MB per Tensix Core)
- **Memory:** 8GB LPDDR4, 256-bit memory bus

## e75/e150 Comparison Table

**NOTE:** The **e150 add-in card** comes with a heatsink for passive cooling in systems which can provide sufficient forced airflow to the card. If your system does not (for example, a desktop workstation), installing the [Active Cooling Kit](../ack.md) is **required**. If the card isn’t sufficiently cooled, performance will be substantially reduced to stay in a safe operating temperature range and you risk damage to the card.

**NOTE:** Software support for Grayskull has been discontinued. The last supported versions of Tenstorrent's software for Grayskull are as follows:

- **TT-Firmware:** `fw_pack-80.14.0.0.fwbundle`
- **TT-KMD:** `ttkmd_1.31`
- **TT-Buda:** `v0.19.3`
- **TT-Metalium:** `v0.55`

| Specification                        | e75                                         | e150                                           |
| ------------------------------------ | ------------------------------------------- | ---------------------------------------------- |
| Part Number                          | TC-01001                                    | TC-01002                                       |
| Tensix Cores                         | 96                                          | 120                                            |
| AI Clock                             | 1 GHz                                       | 1.2 GHz                                        |
| SRAM                                 | 96MB                                        | 120MB                                          |
| Memory                               | 8GB LPDDR4                                  | 8GB LPDDR4                                     |
| Memory Speed                         | 3.2 GT/sec                                  | 3.7 GT/sec                                     |
| Memory Bandwidth                     | 102 GB/sec                                  | 118 GB/sec                                     |
| TeraFLOPS (FP8)                      | 221                                         | 332                                            |
| TeraFLOPS (FP16)                     | 55                                          | 83                                             |
| TeraFLOPS (BLOCKFP8)                 | 55                                          | 83                                             |
| TBP (Total Board Power)              | 75W                                         | 200W                                           |
| External Power                       | 1x 6-pin PCIe *(required for powering fan)* | 1x 6+2-pin PCIe<br />1x 6-pin PCIe             |
| System Interface                     | PCI Express 4.0 x16                         | PCI Express 4.0 x16                            |
| Cooling                              | Active *(blower fan pre-installed)*         | Passive *(Active Cooling Kit sold separately)* |
| Dimensions (w/o Cooling Kit) (WxDxH) | 18mm x 167.5mm x 69mm                       | 36mm x 259.8mm x 111.25mm                      |
| Dimensions (w/ Cooling Kit) (WxDxH)  | 18mm x 257mm x 98mm                         | 36mm x 399mm x 114mm                           |

![](./images/e150_dimensions.png)

*e150 without Active Cooling Kit*

## Data Precision Formats

The e75/e150 support the following data precision formats:

| Format               | Bit Depth                    |
| -------------------- | ---------------------------- |
| Floating point       | FP8, FP16, BFLOAT16          |
| Block floating point | BLOCKFP2, BLOCKFP4, BLOCKFP8 |
| Vector               | VTF19                        |

## Minimum System Requirements

| Part                              | Requirement                                                  |
| --------------------------------- | ------------------------------------------------------------ |
| CPU                               | x86_64 architecture*                                         |
| Motherboard                       | PCI Express 4.0 x16 slot<br />- Single-slot-width (e75)<br />- Dual-slot-width (e150) |
| Memory                            | 64 GB                                                        |
| Storage                           | 100 GB (≥2TB recommended)                                    |
| Power Connectors                  | PCIe 6-pin (e75)<br />PCIe 6+2-pin and PCIe 6-pin (e150)     |
| Total Board Power                 | Up to 75W (e75) / 200W (e150)                                |
| Operating Temperature Range (Die) | 0C - 75C                                                     |
| Operating System                  | Ubuntu version 20.04 (Focal Fossa) **                        |
| Internet Connection               | Required for driver and stack installation.                  |

** CPU core count and number of sockets will depend on the amount of host preprocessing and post-processing required before and after the accelerator processing.*

***To check your version, type* `cat /etc/os-release`.

## Environment Specifications

The Grayskull™ e75 and e150 Tensix Processor add-in boards are designed to meet these environmental specifications:

| Specification                         | Requirement               |
| ------------------------------------- | ------------------------- |
| Operating Temperature Range           | 10°C/50°F - 35°C/95°F     |
| Storage Temperature Range             | -40°C/-40°F - 75°C/167°F  |
| Elevation                             | -5 ft. to 10,000 ft.      |
| Air Flow (without Active Cooling Kit) | ≥30 CFM @ up to 35°C/95°F |