Use the cpuid instruction to generate the CPU brand string. And

content/browser/gpu/software_rendering_list.json

 // Determines whether certain gpu-related features are blacklisted or not.
 // A valid software_rendering_list.json file are in the format of
 // {
 //   "version": "x.y",
 //   "entries": [
 //     { // entry 1
 //     },
 //     ...
 //     { // entry n
 //     }
@@ skipping 18 matching lines @@
 // 9. "driver_date" is a VERSION structure (defined below).
 //    The version is interpreted as "year.month.day".
 // 10. "gl_vendor" is a STRING structure (defined below).
 // 11. "gl_renderer" is a STRING structure (defined below).
 // 12. "perf_graphics" is a FLOAT structure (defined below).
 // 13. "perf_gaming" is a FLOAT structure (defined below).
 // 14. "perf_overall" is a FLOAT structure (defined below).
 // 15. "machine_model" contais "name" and an optional "version".  "name" is a 
 //     STRING structure and "version" is a VERSION structure (defined below).
 // 16. "gpu_count" is a INT structure (defined below).
-// 17. "exceptions" is a list of entries.
-// 18. "blacklist" is a list of gpu feature strings, valid values include
+// 17  "cpu_info" is a STRING structure (defined below).
+// 18. "exceptions" is a list of entries.
+// 19. "blacklist" is a list of gpu feature strings, valid values include
 //     "accelerated_2d_canvas", "accelerated_compositing", "webgl",
 //     "multisampling", "flash_3d", "flash_stage3d", "texture_sharing",
 //     "accelerated_video_decode", and "all".
 //     This field is mandatory.
-// 19. "description" has the description of the entry.
-// 20. "webkit_bugs" is an array of associated webkit bug numbers.
-// 21. "cr_bugs" is an array of associated webkit bug numbers.
-// 22. "browser_version" is a VERSION structure (defined below).  If this
+// 20. "description" has the description of the entry.
+// 21. "webkit_bugs" is an array of associated webkit bug numbers.
+// 22. "cr_bugs" is an array of associated webkit bug numbers.
+// 23. "browser_version" is a VERSION structure (defined below).  If this
 //     condition is not satisfied, the entry will be ignored.  If it is not
 //     present, then the entry applies to all versions of the browser.
-// 23. "disabled" is a boolean. If it is present, the entry will be skipped.
+// 24. "disabled" is a boolean. If it is present, the entry will be skipped.
 //     This can not be used in exceptions.
 //
 // VERSION includes "op", "style", "number", and "number2".  "op" can be any of
 // the following values: "=", "<", "<=", ">", ">=", "any", "between".  "style"
 // is optional and can be "lexical" or "numerical"; if it's not specified, it
 // defaults to "numerical".  "number2" is only used if "op" is "between".
 // "between" is "number <= * <= number2".
 // "number" is used for all "op" values except "any". "number" and "number2"
 // are in the format of x, x.x, x.x.x, etc.
 // Only "driver_version" supports lexical style if the format is major.minor;
 // in that case, major is still numerical, but minor is lexical. 
 //
 // STRING includes "op" and "value".  "op" can be any of the following values:
 // "contains", "beginwith", "endwith", "=".  "value" is a string.
 //
 // FLOAT includes "op" "value", and "value2".  "op" can be any of the
 // following values: "=", "<", "<=", ">", ">=", "any", "between".  "value2" is
 // only used if "op" is "between".  "value" is used for all "op" values except
 // "any". "value" and "value2" are valid float numbers.
 // INT is very much like FLOAT, except that the values need to be integers.
 
 {
   "name": "software rendering list",
   // Please update the version number whenever you change this file.
-  "version": "3.4",
+  "version": "3.5",
   "entries": [
     {
       "id": 1,
       "description": "ATI Radeon X1900 is not compatible with WebGL on the Mac.",
       "webkit_bugs": [47028],
       "os": {
         "type": "macosx"
       },
       "vendor_id": "0x1002",
       "device_id": ["0x7249"],
@@ skipping 363 matching lines @@
       "id": 32,
       "description": "Accelerated 2d canvas is disabled on Windows systems with low perf stats.",
       "cr_bugs": [116350],
       "os": {
         "type": "win"
       },
       "perf_overall": {
         "op": "<",
         "value": "3.5"
       },
+      "exceptions": [
+        {
+          "cpu_info": {
+            "op": "contains",
+            "value": "Atom"
+          }
+        }
+      ],
       "blacklist": [
         "accelerated_2d_canvas"
       ]
     },
     {
       "id": 33,
       "description": "Multisampling is buggy in Intel IvyBridge.",
       "cr_bugs": [116370],
       "os": {
         "type": "linux"
@@ skipping 285 matching lines @@
       "description": "The Intel GMA500 is too slow for Stage3D.",
       "cr_bugs": [152096],
       "vendor_id": "0x8086",
       "device_id": ["0x8108", "0x8109"],
       "blacklist": [
         "flash_stage3d"
       ]
     }
   ]
 }