diff -Naur xf86-video-nouveau-1.0.1.orig/src/nouveau_exa.c xf86-video-nouveau-1.0.1/src/nouveau_exa.c
--- xf86-video-nouveau-1.0.1.orig/src/nouveau_exa.c	2012-06-19 02:01:41.000000000 +0200
+++ xf86-video-nouveau-1.0.1/src/nouveau_exa.c	2012-09-01 22:01:14.155844705 +0200
@@ -125,7 +125,7 @@
 	if (!width || !height)
 		return calloc(1, sizeof(*nvpix));
 
-	if (!pNv->exa_force_cp && pNv->dev->vram_size <= 32 * 1024 * 1024)
+	if (!pNv->exa_force_cp && pNv->dev->vram_size < 8*1020*1020)
 		return NULL;
 
 	nvpix = calloc(1, sizeof(*nvpix));
@@ -382,16 +382,20 @@
 	exa->CreatePixmap2 = nouveau_exa_create_pixmap;
 	exa->DestroyPixmap = nouveau_exa_destroy_pixmap;
 
-	if (pNv->Architecture >= NV_ARCH_50) {
-		exa->maxX = 8192;
-		exa->maxY = 8192;
+	if (pNv->dev->vram_size >= 512*1020*1020) {
+		exa->maxX = 8190;
+		exa->maxY = 8190;
 	} else
-	if (pNv->Architecture >= NV_ARCH_10) {
-		exa->maxX = 4096;
-		exa->maxY = 4096;
+	if (pNv->dev->vram_size >= 128*1020*1020) {
+		exa->maxX = 4094;
+		exa->maxY = 4094;
+	} else
+	if (pNv->dev->vram_size >= 32*1020*1020) {
+		exa->maxX = 2046;
+		exa->maxY = 2046;
 	} else {
-		exa->maxX = 2048;
-		exa->maxY = 2048;
+		exa->maxX = 1022;
+		exa->maxY = 1022;
 	}
 
 	exa->MarkSync = nouveau_exa_mark_sync;